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443:." In 2015, a study by Guillem Anglada-Escudé and Mikko Tuomi questioned the 2014 work, claiming a significant shortcoming in the adopted statistical method; however, this study was published along with a rebuttal by the team that published the 2014 refutation. Another 2015 study added support to the conclusion that the radial velocity signal originates from stellar activity, and a 2016 study provided additional strong evidence for it.
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436:), together with R. P. Butler and N. Haghighipour, published a study that supported the existence of the planet with a much higher probability; they also pursued a dynamical analysis of the system. Additional work on Gliese 581 as a four-planet system (thus, including planet d), demonstrating its long-term orbital stability, was given by Makarov and coauthors.
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484:. These were based on the six-planet and four-planet model for the Gliese 581 system, respectively. Under the four-planet model Gliese 581d would most probably be in a spin-orbit resonance of 2:1, rotating twice for each orbit of its parent star. Therefore, the day on Gliese 581d should approximately be 67 Earth days long.
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hence is inhospitable to life. However, an atmospheric greenhouse effect can significantly raise planetary temperatures. For example, Earth's own mean temperature would be about −18 °C without any greenhouse gases, ranging from around 100 °C on the day side to −150 °C at night, much like that found on the
335:. It was the third planet claimed in the system and the fourth (in a 4-planet model) or fifth (in a disproven 5- or 6-planet model) in order from the star. Multiple subsequent studies found that the planetary signal in fact originates from stellar activity, and thus the planet does not exist, but this remains disputed.
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On average, the light that Gliese 581d receives from its star has about 30% of the intensity of light the Earth receives from the Sun. By comparison, sunlight on Mars has about 40% of the intensity of that on Earth. That might seem to suggest that Gliese 581d is too cold to support liquid water and
446:
In 2016, E. R. Newton and collaborators pointed out that for early M dwarfs, planets in their habitable zones may have orbital periods coinciding with the stellar rotation period (or in rare cases, such as Gliese 581d, half of it, if the standard value of 132 days is assumed); this aspect seriously
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In late April 2009, the original discovery team revised its original estimate of the planet's orbital parameters, finding that it orbits closer to its star than originally determined with an orbital period of 66.8 days. They concluded that the planet is within the habitable zone where liquid water
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The orbital distance places it at the outer limits of the habitable zone, the distance at which it is believed possible for water to exist on the surface of a planetary body. At the time of its discovery, the planet's orbit was originally thought to be farther out. However, in late April 2009 the
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As the planet is not known to transit from Earth and atmospheric conditions are not observable with current technology, no atmosphere for the planet has been confirmed to date. As such, all climate predictions for the planet are based on predicted orbits and computer modelling of theoretical
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original discovery team revised its original estimate of the planet's orbital parameters, finding that it orbits closer to its star than originally determined with an orbital period of 66.87 days. They concluded that the planet is within the habitable zone where liquid water could exist.
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show that the system becomes unstable if the masses of the planets exceed 1.6–2 times the minimum values. Using earlier minimum mass values for Gliese 581d, this implies an upper mass limit for Gliese 581d of 13.8 Earth masses. The composition of the planet, however, is not known.
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Gliese 581d was thought to orbit Gliese 581 at 0.21847 AU, approximately a fifth of the distance that the Earth orbits the Sun, though its orbital eccentricity has not been confirmed. There were two models for its orbit, a circular one like Earth's, and an
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Evidence based on a 2022 paper confirmed the results of previous studies suggesting that the announcement of Gliese 581d stems from a false detection due to stellar activity. This work uses an updated technique correlating stellar activity to RV signals.
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could exist. A 2010 study of aliasing in radial velocity data found that the true period of Gliese 581d remained unclear, with even a 1-day period being a possibility. Later models of the system including planet d from 2010-2013 supported a 67-day period.
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von
Stauffenberg, A.; Trifonov, T.; Quirrenbach, A.; Reffert, S.; Kaminski, A.; Dreizler, S.; Ribas, I.; Reiners, A.; Kürster, M.; Twicken, J. D.; Rapetti, D.; Caballero, J. A.; Amado, P. J.; Béjar, V. J. S.; Cifuentes, C. (August 2024).
470:
from the 2014 study refuting the planet. This new rotation period is not a multiple of the planet's proposed period. However, no reanalysis of the radial velocity data was done, so further research will be needed to draw a conclusion.
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In
September 2012, Roman Baluev filtered out the "red noise" from the Keck data and concluded that this planet's existence is probable only to 2.2 standard deviations, and thus is uncertain. Earlier that same year, however, S. S. Vogt
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Because Gliese 581d was believed to orbit outside the habitable zone of its star it was originally thought to be too cold for liquid water to be present. With the 2009 revised orbit, climate simulations conducted by researchers in
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The motion of the parent star indicates a minimum mass for Gliese 581d of 5.6 Earth masses (earlier analyses gave higher values). Dynamical simulations of the Gliese 581 system assuming that the orbits of the three planets are
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Trifonov, T.; Kürster, M.; et al. (February 2018). "The CARMENES search for exoplanets around M dwarfs. First visual-channel radial-velocity measurements and orbital parameter updates of seven M-dwarf planetary systems".
2338:
Wordsworth, Robin; François Forget; Franck Selsis; Ehouarn
Millour; Benjamin Charnay; Jean-Baptiste Madeleine (2011). "Gliese 581d is the first discovered terrestrial-mass exoplanet in the habitable zone".
1854:
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Udry, Stéphane; Bonfils, Xavier; Delfosse, Xavier; Forveille, Thierry; Mayor, Michel; Perrier, Christian; Bouchy, François; Lovis, Christophe; Pepe, Francesco; Queloz, Didier; Bertaux, Jean-Loup (2007).
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of its parent star. Assuming its existence, computer climate simulations have confirmed the possibility of the existence of surface water and these factors combine to a relatively high measure of
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Robertson, Paul; Mahadevan, Suvrath; Endl, Michael; Roy, Arpita (2015). "Response to
Comment on "Stellar activity masquerading as planets in the habitable zone of the M dwarf Gliese 581"".
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launched a website called "Hello from Earth" to collect messages for transmission to Gliese 581d. The maximum length of the messages was 160 characters, and they were restricted to the
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Gliese 581d is probably too massive to be made only of rocky material. It may have originally formed on a more distant orbit as an icy planet that then migrated closer to its star.
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Suárez
Mascareño, A.; et al. (September 2015), "Rotation periods of late-type dwarf stars from time series high-resolution spectroscopy of chromospheric indicators",
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If Gliese 581d exists, it would be the first super-Earth identified to be located in a habitable zone outside of the Solar System, according to work published in 2007.
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1173:"The CARMENES search for exoplanets around M dwarfs: Revisiting the GJ 581 multi-planetary system with new Doppler measurements from CARMENES, HARPS, and HIRES"
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Anglada-Escudé, Guillem; Tuomi, Mikko (6 March 2015). "Comment on "Stellar activity masquerading as planets in the habitable zone of the M dwarf Gliese 581"".
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596:. In total, 25,880 messages were collected from 195 countries around the world. The messages were transmitted from the DSS-43 70 m radio telescope at the
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A 2024 research note argued that it is still possible that Gliese 581d might exist, on the basis of a new measurement of Gliese 581's rotation period at
47:
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A study in 2014 concluded that Gliese 581d is "an artifact of stellar activity which, when incompletely corrected, causes the false detection of planet
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Makarov, Valeri V.; et al. (2012). "Dynamical evolution and spin-orbit resonances of potentially habitable exoplanets. The case of GJ 581d".
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Dawson, Rebekah I.; Fabrycky, Daniel C. (10 October 2010) . "Radial velocity planets de-aliased. A new, short period for Super-Earth 55 Cnc e".
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might permit a liquid water cycle, conceivably allowing the planet to support life. Calculations by Barnes et al. suggest, however, that
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923:; Endl, Michael; Roy, Arpita (3 July 2014). "Stellar activity masquerading as planets in the habitable zone of the M dwarf Gliese 581".
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Vogt, S. S.; Butler, R. P.; Haghighipour, N. (2012). "GJ 581 update: Additional evidence for a Super-Earth in the habitable zone".
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Wordsworth, R. D.; et al. (2010). "Is Gliese 581d habitable? Some constraints from radiative-convective climate modeling".
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Hatzes, A. P. (August 2013). "An investigation into the radial velocity variability of GJ 581: On the significance of GJ 581g".
718:
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Wordsworth, R.; et al. (2011). "Gliese 581d is the first discovered terrestrial-mass exoplanet in the habitable zone".
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Barnes, Rory; Jackson, Brian; Greenberg, Richard; Raymond, Sean N. (2009-06-09). "Tidal Limits to
Planetary Habitability".
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Heller, René; Barnes, Rory; Leconte, Jérémy. (August 2011). "Habitability of extrasolar planets and tidal spin evolution".
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in 2011 indicated possible temperatures suitable for surface water at sufficient atmospheric pressure. According to
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Newton, Elisabeth R.; Irwin, Jonathan; Charbonneau, David; Berta-Thompson, Zachory K.; Dittmann, Jason A. (2016).
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1105:"Magnitude-squared Coherence: A Powerful Tool for Disentangling Doppler Planet Discoveries from Stellar Activity"
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1406:"The HARPS search for southern extra-solar planets, XVIII. An Earth-mass planet in the GJ 581 planetary system"
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Selsis, Franck; Kasting, James F.; Levrard, Benjamin; Paillet, Jimmy; Ribas, Ignasi; Delfosse, Xavier (2007).
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Hatzes, A. P. (2016). "Periodic Hαvariations in GL 581: Further evidence for an activity origin to GL 581d".
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von Bloh, W.; Bounama, C.; Cuntz, M.; Franck, S. (2007). "The
Habitability of Super-Earths in Gliese 581".
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Dodson-Robinson, Sarah E.; Delgado, Victor
Ramirez; Harrell, Justin; Haley, Charlotte L. (2022-04-01).
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of Gliese 581 compared with our Solar System's habitable zone, showing Gliese 581d near the outer edge
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1851:"Gliese 581d: New Study Confirms Existence of One of Most 'Earth-Like' Extrasolar Planets Known"
1530:"The impact of red noise in radial velocity planet searches: Only three planets orbiting GJ581?"
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1994:"The Impact of Stellar Rotation on the Detectability of Habitable Planets around M Dwarfs"
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von Bloh, W.; et al. (2008). "Habitability of Super-Earths: Gliese 581c and 581d".
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2289:"Centauri Dreams » Blog Archive » Gliese 581d: A Habitable World After All?"
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719:"The HARPS search for southern extra-solar planets XI. Super-Earths (5 and 8
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active on the planet, unless radiogenic heating is somewhat higher than expected.
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is determined based on the small perturbations it induces in its parent star's
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1225:"The Once-canceled Habitable-zone Super-Earth Gliese 581d Might Indeed Exist!"
689:
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1969:
1907:
1788:
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856:
Vogt, S. S.; et al. (2010). "The Lick-Carnegie
Exoplanet Survey: A 3.1
629:
s
Episode 3: The Story of Everything, and in Episode 3 and 8 of Season 2 of
601:
535:, "It could be covered by a 'large and deep ocean'; it is the first serious
388:
316:
212:
17:
2088:
1915:
1819:"Reanalysis of data suggests 'habitable' planet GJ 581d really could exist"
1796:
1612:
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1529:
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126:
0.21847 ± 0.00028 AU (32,683,000 ± 42,000 km)
2190:
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Mayor, Michel; Bonfils, Xavier; Forveille, Thierry; et al. (2009).
4507:
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2200:, European Southern Observatory. April 21, 2009. Accessed June 10, 2011
416:
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528:
408:
2580:
419:. This study estimated an orbital period of 83 days for the planet.
2012:
1951:
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1223:
Cuntz, Manfred; Engle, Scott G.; Guinan, Edward F. (January 2024).
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509:
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83:
863:
Planet in the Habitable Zone of the Nearby M3V Star Gliese 581".
547:. If the atmosphere of Gliese 581d produces a sufficiently large
4405:
3735:
2961:
544:
433:
347:
247:
3739:
2760:
2584:
1726:"New doubt cast on 2 of the most Earth-like planets ever found"
555:
levels (as Earth's does via plate tectonics), then the surface
293:
160:
2502:"Visit Doctor Who's spectacular colony world... In Valencia"
399:, to discover the planet in 2007. Udry's team employed the
299:
2529:
National Science Week 2009 - Send A Message To Gliese 581d
2620:
287:
2314:"New 'Super Earth 2' Discovered in Constellation Libra"
44:
Size comparison of Gliese 581d with Earth and Neptune.
3700:
Potential cultural impact of extraterrestrial contact
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1096:
296:
290:
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4015:
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3620:
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3013:
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2237:
Proceedings of the International Astronomical Union
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210:
192:
167:
146:
130:
118:
111:
97:
89:
73:
60:
55:
447:complicates the verification of any such planets.
3080:Habitability of F-type main-sequence star systems
3070:Habitability of K-type main-sequence star systems
1939:Monthly Notices of the Royal Astronomical Society
1534:Monthly Notices of the Royal Astronomical Society
3367:Communication with extraterrestrial intelligence
2624:
2213:. Lwf.ncdc.noaa.gov. 2008-05-08. Archived from
342:(at a minimum mass of 6.98 Earth masses), this
914:
912:
551:, and the planet's geophysics stabilize the CO
3751:
2772:
2596:
2316:. Dailygalaxy.com. 2007-06-15. Archived from
1694:"Earthlike Planets May Be Merely an Illusion"
1324:
1322:
8:
994:
992:
789:
787:
32:
3675:History of the extraterrestrial life debate
3372:Gauss's Pythagorean right triangle proposal
2211:"Global Warming Frequently Asked Questions"
2055:Origins of Life and Evolution of Biospheres
1632:
1630:
1331:"Habitable planets around the star Gl 581?"
1218:
1216:
3758:
3744:
3736:
2990:Planetary habitability in the Solar System
2857:
2779:
2765:
2757:
2603:
2589:
2581:
2477:"Earth sends 25,000 hellos to outer space"
346:was the first exoplanet of relatively low
315:) is a doubtful, and frequently disputed,
38:
2547:
2446:"Hopes Dashed for Life on Distant Planet"
2405:
2352:
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2011:
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1138:
1120:
1068:
1012:
956:
938:
876:
809:
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598:Canberra Deep Space Communication Complex
27:Contested super-Earth orbiting Gliese 581
3417:Search for extraterrestrial intelligence
3085:List of potentially habitable exoplanets
1399:
1397:
1395:
695:List of potentially habitable exoplanets
3222:Living Interplanetary Flight Experiment
1266:
1264:
1262:
705:
338:Though significantly more massive than
1736:from the original on December 30, 2016
851:
849:
847:
845:
711:
709:
625:Into the Universe with Stephen Hawking
462:, as opposed to the previous value of
31:
4498:(end of mission; Mar 2010 / May 2011)
3123:Biological Oxidant and Life Detection
2456:from the original on 15 December 2010
2113:. eso.org. 2009-04-21. Archived from
7:
3075:Habitability of yellow dwarf systems
3060:Habitability of neutron star systems
2820:Viking lander biological experiments
2133:
2131:
3050:Habitability of binary star systems
3025:Catalog of Nearby Habitable Systems
2291:. Centauri-dreams.org. 2007-12-13.
2191:"Lightest exoplanet yet discovered"
2111:"Lightest exoplanet yet discovered"
612:Gliese 581d is the setting for the
3685:Nexus for Exoplanet System Science
3528:Hypothetical types of biochemistry
3055:Habitability of natural satellites
1706:from the original on 29 March 2019
25:
3065:Habitability of red dwarf systems
4534:
4533:
4522:
4439:
4019:
3852:
3846:
3840:
3787:
3217:Life Investigation For Enceladus
2740:
2730:
2729:
2479:. Brisbane Times. Archived from
1857:from the original on 7 July 2019
1831:from the original on 20 May 2015
1692:Quenqua, Douglas (7 July 2014).
659:
645:
350:regarded as orbiting within the
280:
46:(Based on selected hypothetical
3808:(mission to the Moon; Sep 2011)
2508:from the original on 2017-04-27
2295:from the original on 2015-12-22
1381:from the original on 2018-11-04
3207:Journey to Enceladus and Titan
1:
3340:Berkeley SETI Research Center
3040:Extraterrestrial liquid water
2475:Jenkins, Simon (2009-08-28).
1999:Astrophysical Journal Letters
385:European Southern Observatory
371:A team of astronomers led by
4549:Category:2012 in outer space
4544:Category:2011 in outer space
4539:Category:2010 in outer space
4510:orbital insertion; Jul 2011)
4490:orbital insertion; Apr 2011)
3660:Extraterrestrials in fiction
3533:Interplanetary contamination
3030:Circumstellar habitable zone
2914:(unusual light fluctuations)
2906:(unusual light fluctuations)
2898:(unusual light fluctuations)
2536:Astronomy & Astrophysics
2057:. Onlinefirst (6): 539–543.
1274:Astronomy & Astrophysics
1177:Astronomy & Astrophysics
1056:Astronomy & Astrophysics
1001:Astronomy & Astrophysics
733:Astronomy & Astrophysics
482:eccentric one like Mercury's
4461:45P/Honda–Mrkos–Pajdušáková
3833:(mission to Mars; Nov 2011)
3827:(mission to Mars; Nov 2011)
3802:(Jupiter orbiter; Aug 2011)
3518:Extraterrestrial hypothesis
2566:10.1051/0004-6361/201015053
2424:10.1088/0004-637X/700/1/L30
2371:10.1088/2041-8205/733/2/L48
2170:10.1088/2041-8205/733/2/L48
2031:10.3847/2041-8205/821/1/L19
1507:10.1088/0004-637X/722/1/937
1445:10.1051/0004-6361/200912172
1199:10.1051/0004-6361/202449375
1087:10.1051/0004-6361/201731442
1031:10.1051/0004-6361/201527135
895:10.1088/0004-637X/723/1/954
585:celebrations in Australia,
327:system, approximately 20.4
195:Argument of periastron
4594:
3232:Mars sample-return mission
1671:10.1088/0004-637X/761/2/83
1414:Astronomy and Astrophysics
1367:10.1051/0004-6361:20078091
1336:Astronomy and Astrophysics
1305:10.1051/0004-6361:20077939
763:10.1051/0004-6361:20077612
4517:
3872:Asteroid close approaches
3838:
3814:(Mars orbiter); Nov 2011)
3771:
2985:Earliest known life forms
2721:
2618:
2394:The Astrophysical Journal
2341:The Astrophysical Journal
2267:10.1017/S1743921308017031
2140:The Astrophysical Journal
2081:10.1007/s11084-011-9252-3
1640:The Astrophysical Journal
1582:Astronomische Nachrichten
1476:The Astrophysical Journal
1230:Research Notes of the AAS
865:The Astrophysical Journal
797:Astronomische Nachrichten
270:
149:Orbital period (sidereal)
37:
3350:Breakthrough Initiatives
1252:10.3847/2515-5172/ad1de4
1140:10.3847/1538-3881/ac52ed
1109:The Astronomical Journal
523:atmospheric conditions.
506:Climate and habitability
492:Physical characteristics
403:technique, in which the
242:Physical characteristics
3818:Mars Science Laboratory
3454:extraterrestrial beings
3045:Galactic habitable zone
2558:2010A&A...522A..22W
1908:10.1126/science.1260974
1789:10.1126/science.1260796
1437:2009A&A...507..487M
1359:2007A&A...476.1373S
1297:2007A&A...476.1365V
1079:2018A&A...609A.117T
1023:2016A&A...585A.144H
967:10.1126/science.1253253
755:2007A&A...469L..43U
726:) in a 3-planet system"
622:". It is also shown in
475:Orbital characteristics
170:Time of periastron
113:Orbital characteristics
4529:Outer space portal
3602:Planetarium hypothesis
3592:Hart–Tipler conjecture
3577:Dark forest hypothesis
3567:Aestivation hypothesis
3286:Venus In Situ Explorer
3090:Planetary habitability
2879:(misidentified quasar)
2871:(misidentified pulsar)
2632:
1613:10.1002/asna.201211707
828:10.1002/asna.201311913
632:How the Universe Works
519:
356:planetary habitability
3705:Post-detection policy
3607:Rare Earth hypothesis
3432:Voyager Golden Record
3325:Allen Telescope Array
3160:Enceladus Life Finder
3095:Superhabitable planet
2788:Extraterrestrial life
2631:
1970:10.1093/mnras/stv1441
1528:Roman Baluev (2012).
604:, on 28 August 2009.
583:National Science Week
513:
4573:Exoplanet candidates
3785:Space probe launches
3695:Planetary protection
3582:Firstborn hypothesis
3572:Berserker hypothesis
3543:Mediocrity principle
3360:Breakthrough Message
2978:Life in the Universe
2708:A Message from Earth
1565:10.1093/mnras/sts476
581:As part of the 2009
307:(often shortened to
80:La Silla Observatory
48:modeled compositions
4466:C/2011 W3 (Lovejoy)
4385:SDSS J102915+172927
3508:Directed panspermia
3487:Reptilian humanoids
3355:Breakthrough Listen
3335:Arecibo Observatory
3281:Titan Mare Explorer
2854:Signals of interest
2814:Murchison meteorite
2802:Shergotty meteorite
2735:Category:Gliese 581
2416:2009ApJ...700L..30B
2363:2011ApJ...733L..48W
2259:2008IAUS..249..503V
2162:2011ApJ...733L..48W
2073:2011OLEB...41..539H
2022:2016ApJ...821L..19N
2006:(1): L 19 (6 pp.).
1961:2015MNRAS.452.2745S
1900:2015Sci...347.1080R
1781:2015Sci...347.1080A
1663:2012ApJ...761...83M
1605:2012AN....333..561V
1556:2013MNRAS.429.2052B
1499:2010ApJ...722..937D
1243:2024RNAAS...8...20C
1131:2022AJ....163..169D
949:2014Sci...345..440R
887:2010ApJ...723..954V
820:2013AN....334..616H
780:on October 8, 2010.
563:is too low to keep
333:Libra constellation
90:Discovery date
75:Discovery site
34:
4294:MOA-2009-BLG-387Lb
3630:Ancient astronauts
3227:Mars Geyser Hopper
3155:Enceladus Explorer
2795:Events and objects
2633:
2196:2011-05-24 at the
921:Mahadevan, Suvrath
608:In popular culture
520:
427:Disputed existence
383:instrument on the
377:Geneva Observatory
62:Discovered by
4557:
4556:
4475:Space exploration
3733:
3732:
3263:SpaceX Red Dragon
3178:Rosalind Franklin
2973:
2972:
2832:Allan Hills 84001
2826:Allan Hills 77005
2754:
2753:
2612:Gliese 581 system
933:(6195): 440–444.
919:Robertson, Paul;
549:greenhouse effect
274:
273:
16:(Redirected from
4585:
4537:
4536:
4527:
4526:
4525:
4455:
4443:
4391:moons of Jupiter
4376:
4374:
4373:
4299:PSR J1719−1438 b
4050:habitability of
4023:
4008:
4006:
4005:
3996:
3994:
3993:
3989:(549948) 2011 WL
3984:
3982:
3981:
3977:(308635) 2005 YU
3972:
3970:
3969:
3965:(436724) 2011 UW
3960:
3958:
3957:
3953:(415029) 2011 UL
3933:
3931:
3930:
3921:
3919:
3918:
3909:
3907:
3906:
3897:
3895:
3894:
3890:(471240) 2011 BT
3885:
3883:
3882:
3878:(367789) 2011 AG
3856:
3850:
3844:
3791:
3760:
3753:
3746:
3737:
3710:San Marino Scale
3650:Brookings Report
3597:Neocatastrophism
3503:Cosmic pluralism
3477:Little green men
3452:Types of alleged
3377:Astrolinguistics
2966:
2958:
2957:(unknown origin)
2954:Fast radio burst
2950:
2942:
2923:
2922:(unknown origin)
2919:HD 164595 signal
2915:
2907:
2899:
2880:
2872:
2858:
2808:Nakhla meteorite
2781:
2774:
2767:
2758:
2746:Portal:Astronomy
2744:
2733:
2732:
2713:Hello from Earth
2623:
2605:
2598:
2591:
2582:
2577:
2551:
2517:
2516:
2514:
2513:
2498:
2492:
2491:
2489:
2488:
2472:
2466:
2465:
2463:
2461:
2452:. 18 June 2007.
2442:
2436:
2435:
2409:
2389:
2383:
2382:
2356:
2335:
2329:
2328:
2326:
2325:
2310:
2304:
2303:
2301:
2300:
2285:
2279:
2278:
2252:
2232:
2226:
2225:
2223:
2222:
2207:
2201:
2188:
2182:
2181:
2155:
2135:
2126:
2125:
2123:
2122:
2107:
2101:
2100:
2066:
2050:
2044:
2043:
2033:
2015:
1989:
1983:
1982:
1972:
1954:
1945:(3): 2745–2756,
1934:
1928:
1927:
1893:
1873:
1867:
1866:
1864:
1862:
1853:. 8 March 2015.
1847:
1841:
1840:
1838:
1836:
1827:. 9 March 2015.
1815:
1809:
1808:
1774:
1765:(6226): 1080–b.
1752:
1746:
1745:
1743:
1741:
1722:
1716:
1715:
1713:
1711:
1689:
1683:
1682:
1656:
1634:
1625:
1624:
1598:
1576:
1570:
1569:
1567:
1549:
1540:(3): 2052–2068.
1525:
1519:
1518:
1492:
1470:
1464:
1463:
1461:
1455:. Archived from
1430:
1410:
1401:
1390:
1389:
1387:
1386:
1352:
1343:(3): 1373–1387.
1326:
1317:
1316:
1290:
1281:(3): 1365–1371.
1268:
1257:
1256:
1254:
1220:
1211:
1210:
1192:
1167:
1161:
1160:
1142:
1124:
1100:
1091:
1090:
1072:
1049:
1043:
1042:
1016:
996:
987:
986:
960:
942:
916:
907:
906:
880:
853:
840:
839:
813:
791:
782:
781:
779:
773:. Archived from
748:
730:
713:
669:
664:
663:
662:
655:
653:Astronomy portal
650:
649:
648:
600:at Tidbinbilla,
594:English language
577:Hello from Earth
469:
467:
461:
459:
306:
305:
302:
301:
298:
295:
292:
289:
286:
266:
256:
227:
222:
215:
206:
204:
188:
183:
179:
163:
158:
142:
140:
100:Detection method
42:
35:
21:
4593:
4592:
4588:
4587:
4586:
4584:
4583:
4582:
4563:
4562:
4560:
4558:
4553:
4523:
4521:
4513:
4470:
4454:
4450:
4433:
4400:
4371:
4370:
4367:
4355:Kerberos (moon)
4350:ULAS J1120+0641
4318:
4011:
4003:
4002:
3999:
3991:
3990:
3987:
3979:
3978:
3975:
3967:
3966:
3963:
3955:
3954:
3951:
3928:
3927:
3924:
3916:
3915:
3912:
3904:
3903:
3900:
3892:
3891:
3888:
3880:
3879:
3876:
3857:
3851:
3845:
3836:
3779:
3778:
3767:
3764:
3734:
3729:
3725:Xenoarchaeology
3715:Technosignature
3616:
3552:
3538:Kardashev scale
3491:
3453:
3446:
3442:Xenolinguistics
3407:Project Phoenix
3397:Project Cyclops
3382:Lincos language
3345:Bracewell probe
3330:Arecibo message
3311:
3304:
3202:Icebreaker Life
3104:
3016:
3009:
2969:
2964:
2956:
2948:
2940:
2926:
2921:
2913:
2905:
2897:
2883:
2878:
2870:
2849:
2790:
2785:
2755:
2750:
2717:
2696:
2650:
2634:
2630:
2621:
2614:
2609:
2533:
2525:
2520:
2511:
2509:
2500:
2499:
2495:
2486:
2484:
2474:
2473:
2469:
2459:
2457:
2444:
2443:
2439:
2391:
2390:
2386:
2337:
2336:
2332:
2323:
2321:
2312:
2311:
2307:
2298:
2296:
2287:
2286:
2282:
2234:
2233:
2229:
2220:
2218:
2209:
2208:
2204:
2198:Wayback Machine
2189:
2185:
2137:
2136:
2129:
2120:
2118:
2109:
2108:
2104:
2052:
2051:
2047:
1991:
1990:
1986:
1936:
1935:
1931:
1875:
1874:
1870:
1860:
1858:
1849:
1848:
1844:
1834:
1832:
1817:
1816:
1812:
1754:
1753:
1749:
1739:
1737:
1724:
1723:
1719:
1709:
1707:
1691:
1690:
1686:
1636:
1635:
1628:
1578:
1577:
1573:
1527:
1526:
1522:
1472:
1471:
1467:
1462:on 21 May 2009.
1459:
1408:
1403:
1402:
1393:
1384:
1382:
1328:
1327:
1320:
1270:
1269:
1260:
1222:
1221:
1214:
1169:
1168:
1164:
1102:
1101:
1094:
1051:
1050:
1046:
998:
997:
990:
958:10.1.1.767.2071
918:
917:
910:
862:
859:
855:
854:
843:
793:
792:
785:
777:
728:
725:
722:
715:
714:
707:
703:
665:
660:
658:
651:
646:
644:
641:
610:
579:
565:plate tectonics
554:
508:
494:
477:
465:
463:
457:
455:
429:
401:radial velocity
369:
364:
283:
279:
264:
254:
252:
220:
218:
211:
202:
200:
197:
181:
177:
175:
172:
156:
154:
151:
138:
136:
123:
121:Semi-major axis
106:Radial velocity
102:
51:
45:
28:
23:
22:
15:
12:
11:
5:
4591:
4589:
4581:
4580:
4575:
4565:
4564:
4555:
4554:
4552:
4551:
4531:
4518:
4515:
4514:
4512:
4511:
4499:
4491:
4478:
4476:
4472:
4471:
4469:
4468:
4463:
4458:
4452:
4446:
4444:
4435:
4434:
4432:
4431:
4426:
4421:
4416:
4410:
4408:
4402:
4401:
4399:
4398:
4393:
4387:
4382:
4377:
4362:
4360:PSR J1719−1438
4357:
4352:
4347:
4342:
4337:
4335:Swift J1644+57
4332:
4326:
4324:
4320:
4319:
4317:
4316:
4311:
4306:
4301:
4296:
4291:
4286:
4285:
4284:
4279:
4269:
4264:
4259:
4258:
4257:
4252:
4247:
4242:
4237:
4227:
4226:
4225:
4222:
4219:
4211:
4206:
4201:
4200:
4199:
4194:
4189:
4184:
4179:
4174:
4164:
4163:
4162:
4157:
4147:
4142:
4137:
4136:
4135:
4130:
4127:
4119:
4114:
4109:
4104:
4099:
4094:
4089:
4084:
4079:
4074:
4069:
4064:
4059:
4054:
4048:
4043:
4042:
4041:
4038:
4035:
4026:
4024:
4013:
4012:
4010:
4009:
3997:
3985:
3973:
3961:
3949:
3944:
3939:
3934:
3922:
3910:
3898:
3886:
3874:
3868:
3866:
3859:
3858:
3839:
3837:
3835:
3834:
3828:
3815:
3809:
3803:
3794:
3792:
3781:
3780:
3773:
3772:
3769:
3768:
3765:
3763:
3762:
3755:
3748:
3740:
3731:
3730:
3728:
3727:
3722:
3717:
3712:
3707:
3702:
3697:
3692:
3687:
3682:
3677:
3672:
3667:
3662:
3657:
3652:
3647:
3642:
3637:
3632:
3626:
3624:
3622:Related topics
3618:
3617:
3615:
3614:
3612:Zoo hypothesis
3609:
3604:
3599:
3594:
3589:
3584:
3579:
3574:
3569:
3563:
3561:
3554:
3553:
3551:
3550:
3545:
3540:
3535:
3530:
3525:
3520:
3515:
3513:Drake equation
3510:
3505:
3499:
3497:
3493:
3492:
3490:
3489:
3484:
3479:
3474:
3469:
3464:
3458:
3456:
3448:
3447:
3445:
3444:
3439:
3434:
3429:
3424:
3419:
3414:
3409:
3404:
3399:
3394:
3392:Pioneer plaque
3389:
3384:
3379:
3374:
3369:
3364:
3363:
3362:
3357:
3347:
3342:
3337:
3332:
3327:
3322:
3316:
3314:
3306:
3305:
3303:
3302:
3295:
3288:
3283:
3278:
3273:
3265:
3260:
3252:
3244:
3242:Northern Light
3239:
3234:
3229:
3224:
3219:
3214:
3209:
3204:
3199:
3194:
3189:
3184:
3183:
3182:
3169:
3166:Europa Clipper
3162:
3157:
3152:
3145:
3138:
3130:
3125:
3120:
3114:
3112:
3110:Space missions
3106:
3105:
3103:
3102:
3097:
3092:
3087:
3082:
3077:
3072:
3067:
3062:
3057:
3052:
3047:
3042:
3037:
3032:
3027:
3021:
3019:
3011:
3010:
3008:
3007:
3002:
2997:
2992:
2987:
2981:
2979:
2975:
2974:
2971:
2970:
2968:
2967:
2965:(radio signal)
2959:
2951:
2949:(inconclusive)
2943:
2941:(radio source)
2934:
2932:
2928:
2927:
2925:
2924:
2916:
2908:
2903:EPIC 204278916
2900:
2891:
2889:
2885:
2884:
2882:
2881:
2873:
2864:
2862:
2855:
2851:
2850:
2848:
2847:
2841:
2835:
2829:
2823:
2817:
2811:
2805:
2798:
2796:
2792:
2791:
2786:
2784:
2783:
2776:
2769:
2761:
2752:
2751:
2749:
2748:
2737:
2726:
2722:
2719:
2718:
2716:
2715:
2710:
2704:
2702:
2698:
2697:
2695:
2694:
2689:
2681:
2674:
2669:
2664:
2658:
2656:
2652:
2651:
2649:
2648:
2642:
2640:
2636:
2635:
2619:
2616:
2615:
2610:
2608:
2607:
2600:
2593:
2585:
2579:
2578:
2531:
2524:
2523:External links
2521:
2519:
2518:
2493:
2467:
2437:
2400:(1): L30–L33.
2384:
2330:
2305:
2280:
2227:
2202:
2183:
2127:
2102:
2045:
1984:
1929:
1884:(6226): 1080.
1868:
1842:
1810:
1747:
1717:
1699:New York Times
1684:
1626:
1571:
1520:
1483:(1): 937–953.
1465:
1421:(1): 487–494.
1391:
1318:
1258:
1212:
1162:
1092:
1044:
988:
908:
871:(1): 954–965.
860:
857:
841:
783:
739:(3): L43–L47.
723:
720:
704:
702:
699:
698:
697:
692:
687:
682:
677:
671:
670:
656:
640:
637:
609:
606:
578:
575:
552:
516:habitable zone
507:
504:
493:
490:
476:
473:
428:
425:
368:
365:
363:
360:
352:habitable zone
272:
271:
268:
267:
262:
250:
244:
243:
239:
238:
233:
229:
228:
216:
213:Semi-amplitude
208:
207:
198:
193:
190:
189:
173:
168:
165:
164:
152:
147:
144:
143:
134:
128:
127:
124:
119:
116:
115:
109:
108:
103:
98:
95:
94:
91:
87:
86:
77:
71:
70:
64:
58:
57:
53:
52:
43:
26:
24:
14:
13:
10:
9:
6:
4:
3:
2:
4590:
4579:
4576:
4574:
4571:
4570:
4568:
4561:
4550:
4546:
4545:
4540:
4532:
4530:
4520:
4519:
4516:
4509:
4505:
4504:
4500:
4497:
4496:
4492:
4489:
4485:
4484:
4480:
4479:
4477:
4473:
4467:
4464:
4462:
4459:
4457:
4448:
4447:
4445:
4442:
4436:
4430:
4427:
4425:
4422:
4420:
4417:
4415:
4412:
4411:
4409:
4407:
4403:
4397:
4394:
4392:
4388:
4386:
4383:
4381:
4378:
4375:
4366:
4365:Uranus trojan
4363:
4361:
4358:
4356:
4353:
4351:
4348:
4346:
4343:
4341:
4340:Kronberger 61
4338:
4336:
4333:
4331:
4330:UDFj-39546284
4328:
4327:
4325:
4321:
4315:
4312:
4310:
4307:
4305:
4302:
4300:
4297:
4295:
4292:
4290:
4287:
4283:
4280:
4278:
4275:
4274:
4273:
4270:
4268:
4265:
4263:
4260:
4256:
4253:
4251:
4248:
4246:
4243:
4241:
4238:
4236:
4233:
4232:
4231:
4228:
4223:
4220:
4217:
4216:
4215:
4212:
4210:
4207:
4205:
4202:
4198:
4195:
4193:
4190:
4188:
4185:
4183:
4180:
4178:
4175:
4173:
4170:
4169:
4168:
4165:
4161:
4158:
4156:
4153:
4152:
4151:
4148:
4146:
4143:
4141:
4138:
4134:
4131:
4128:
4125:
4124:
4123:
4120:
4118:
4115:
4113:
4110:
4108:
4105:
4103:
4100:
4098:
4095:
4093:
4090:
4088:
4085:
4083:
4080:
4078:
4075:
4073:
4070:
4068:
4065:
4063:
4060:
4058:
4057:Gliese 3634 b
4055:
4053:
4049:
4047:
4044:
4039:
4036:
4033:
4032:
4031:
4030:82 G. Eridani
4028:
4027:
4025:
4022:
4018:
4014:
4007:
3998:
3995:
3986:
3983:
3974:
3971:
3962:
3959:
3950:
3948:
3945:
3943:
3940:
3938:
3935:
3932:
3923:
3920:
3911:
3908:
3899:
3896:
3887:
3884:
3875:
3873:
3870:
3869:
3867:
3865:
3860:
3855:
3849:
3843:
3832:
3829:
3826:
3824:
3819:
3816:
3813:
3810:
3807:
3804:
3801:
3800:
3796:
3795:
3793:
3790:
3786:
3782:
3776:
3770:
3766:2011 in space
3761:
3756:
3754:
3749:
3747:
3742:
3741:
3738:
3726:
3723:
3721:
3718:
3716:
3713:
3711:
3708:
3706:
3703:
3701:
3698:
3696:
3693:
3691:
3688:
3686:
3683:
3681:
3678:
3676:
3673:
3671:
3668:
3666:
3663:
3661:
3658:
3656:
3653:
3651:
3648:
3646:
3643:
3641:
3638:
3636:
3633:
3631:
3628:
3627:
3625:
3623:
3619:
3613:
3610:
3608:
3605:
3603:
3600:
3598:
3595:
3593:
3590:
3588:
3585:
3583:
3580:
3578:
3575:
3573:
3570:
3568:
3565:
3564:
3562:
3559:
3558:Fermi paradox
3555:
3549:
3546:
3544:
3541:
3539:
3536:
3534:
3531:
3529:
3526:
3524:
3523:Fermi paradox
3521:
3519:
3516:
3514:
3511:
3509:
3506:
3504:
3501:
3500:
3498:
3494:
3488:
3485:
3483:
3482:Nordic aliens
3480:
3478:
3475:
3473:
3470:
3468:
3465:
3463:
3462:Energy beings
3460:
3459:
3457:
3455:
3449:
3443:
3440:
3438:
3435:
3433:
3430:
3428:
3425:
3423:
3420:
3418:
3415:
3413:
3410:
3408:
3405:
3403:
3400:
3398:
3395:
3393:
3390:
3388:
3385:
3383:
3380:
3378:
3375:
3373:
3370:
3368:
3365:
3361:
3358:
3356:
3353:
3352:
3351:
3348:
3346:
3343:
3341:
3338:
3336:
3333:
3331:
3328:
3326:
3323:
3321:
3318:
3317:
3315:
3313:
3312:communication
3307:
3301:
3300:
3296:
3294:
3293:
3289:
3287:
3284:
3282:
3279:
3277:
3274:
3272:
3270:
3266:
3264:
3261:
3259:
3257:
3253:
3251:
3249:
3245:
3243:
3240:
3238:
3235:
3233:
3230:
3228:
3225:
3223:
3220:
3218:
3215:
3213:
3210:
3208:
3205:
3203:
3200:
3198:
3195:
3193:
3190:
3188:
3185:
3181:
3179:
3175:
3174:
3173:
3170:
3168:
3167:
3163:
3161:
3158:
3156:
3153:
3151:
3150:
3146:
3144:
3143:
3139:
3137:
3135:
3131:
3129:
3126:
3124:
3121:
3119:
3116:
3115:
3113:
3111:
3107:
3101:
3098:
3096:
3093:
3091:
3088:
3086:
3083:
3081:
3078:
3076:
3073:
3071:
3068:
3066:
3063:
3061:
3058:
3056:
3053:
3051:
3048:
3046:
3043:
3041:
3038:
3036:
3033:
3031:
3028:
3026:
3023:
3022:
3020:
3018:
3012:
3006:
3005:Life on Titan
3003:
3001:
2998:
2996:
2995:Life on Venus
2993:
2991:
2988:
2986:
2983:
2982:
2980:
2976:
2963:
2960:
2955:
2952:
2947:
2944:
2939:
2936:
2935:
2933:
2929:
2920:
2917:
2912:
2909:
2904:
2901:
2896:
2893:
2892:
2890:
2886:
2877:
2874:
2869:
2866:
2865:
2863:
2861:Misidentified
2859:
2856:
2852:
2845:
2842:
2839:
2838:Yamato 000593
2836:
2833:
2830:
2827:
2824:
2821:
2818:
2815:
2812:
2809:
2806:
2803:
2800:
2799:
2797:
2793:
2789:
2782:
2777:
2775:
2770:
2768:
2763:
2762:
2759:
2747:
2743:
2738:
2736:
2727:
2724:
2723:
2720:
2714:
2711:
2709:
2706:
2705:
2703:
2699:
2693:
2690:
2688:
2686:
2682:
2680:
2679:
2675:
2673:
2670:
2668:
2665:
2663:
2660:
2659:
2657:
2653:
2647:
2644:
2643:
2641:
2637:
2617:
2613:
2606:
2601:
2599:
2594:
2592:
2587:
2586:
2583:
2575:
2571:
2567:
2563:
2559:
2555:
2550:
2545:
2541:
2537:
2532:
2530:
2527:
2526:
2522:
2507:
2503:
2497:
2494:
2483:on 2014-07-14
2482:
2478:
2471:
2468:
2455:
2451:
2447:
2441:
2438:
2433:
2429:
2425:
2421:
2417:
2413:
2408:
2403:
2399:
2395:
2388:
2385:
2380:
2376:
2372:
2368:
2364:
2360:
2355:
2350:
2346:
2342:
2334:
2331:
2320:on 2009-01-11
2319:
2315:
2309:
2306:
2294:
2290:
2284:
2281:
2276:
2272:
2268:
2264:
2260:
2256:
2251:
2246:
2242:
2238:
2231:
2228:
2217:on 2009-01-19
2216:
2212:
2206:
2203:
2199:
2195:
2192:
2187:
2184:
2179:
2175:
2171:
2167:
2163:
2159:
2154:
2149:
2145:
2141:
2134:
2132:
2128:
2117:on 2009-07-05
2116:
2112:
2106:
2103:
2098:
2094:
2090:
2086:
2082:
2078:
2074:
2070:
2065:
2060:
2056:
2049:
2046:
2041:
2037:
2032:
2027:
2023:
2019:
2014:
2009:
2005:
2001:
2000:
1995:
1988:
1985:
1980:
1976:
1971:
1966:
1962:
1958:
1953:
1948:
1944:
1940:
1933:
1930:
1925:
1921:
1917:
1913:
1909:
1905:
1901:
1897:
1892:
1887:
1883:
1879:
1872:
1869:
1856:
1852:
1846:
1843:
1830:
1826:
1825:
1824:Astronomy Now
1820:
1814:
1811:
1806:
1802:
1798:
1794:
1790:
1786:
1782:
1778:
1773:
1768:
1764:
1760:
1759:
1751:
1748:
1735:
1731:
1727:
1721:
1718:
1705:
1701:
1700:
1695:
1688:
1685:
1680:
1676:
1672:
1668:
1664:
1660:
1655:
1650:
1646:
1642:
1641:
1633:
1631:
1627:
1622:
1618:
1614:
1610:
1606:
1602:
1597:
1592:
1588:
1584:
1583:
1575:
1572:
1566:
1561:
1557:
1553:
1548:
1543:
1539:
1535:
1531:
1524:
1521:
1516:
1512:
1508:
1504:
1500:
1496:
1491:
1486:
1482:
1478:
1477:
1469:
1466:
1458:
1454:
1450:
1446:
1442:
1438:
1434:
1429:
1424:
1420:
1416:
1415:
1407:
1400:
1398:
1396:
1392:
1380:
1376:
1372:
1368:
1364:
1360:
1356:
1351:
1346:
1342:
1338:
1337:
1332:
1325:
1323:
1319:
1314:
1310:
1306:
1302:
1298:
1294:
1289:
1284:
1280:
1276:
1275:
1267:
1265:
1263:
1259:
1253:
1248:
1244:
1240:
1236:
1232:
1231:
1226:
1219:
1217:
1213:
1208:
1204:
1200:
1196:
1191:
1186:
1182:
1178:
1174:
1166:
1163:
1158:
1154:
1150:
1146:
1141:
1136:
1132:
1128:
1123:
1118:
1114:
1110:
1106:
1099:
1097:
1093:
1088:
1084:
1080:
1076:
1071:
1066:
1062:
1058:
1057:
1048:
1045:
1040:
1036:
1032:
1028:
1024:
1020:
1015:
1010:
1006:
1002:
995:
993:
989:
984:
980:
976:
972:
968:
964:
959:
954:
950:
946:
941:
936:
932:
928:
927:
922:
915:
913:
909:
904:
900:
896:
892:
888:
884:
879:
874:
870:
866:
852:
850:
848:
846:
842:
837:
833:
829:
825:
821:
817:
812:
807:
803:
799:
798:
790:
788:
784:
776:
772:
768:
764:
760:
756:
752:
747:
742:
738:
734:
727:
712:
710:
706:
700:
696:
693:
691:
688:
686:
683:
681:
680:Gliese 667 Cc
678:
676:
673:
672:
668:
657:
654:
643:
638:
636:
634:
633:
628:
626:
621:
617:
616:
607:
605:
603:
599:
595:
591:
589:
584:
576:
574:
571:
568:
566:
562:
561:tidal heating
558:
550:
546:
540:
538:
534:
533:Stéphane Udry
530:
524:
517:
512:
505:
503:
500:
491:
489:
485:
483:
474:
472:
452:
448:
444:
442:
437:
435:
426:
424:
420:
418:
414:
410:
406:
402:
398:
394:
390:
386:
382:
378:
374:
373:Stéphane Udry
366:
361:
359:
357:
353:
349:
345:
341:
336:
334:
330:
326:
322:
318:
314:
310:
304:
278:
269:
265:
261:
251:
249:
245:
240:
237:
234:
230:
226:
217:
214:
209:
199:
196:
191:
187:
174:
171:
166:
162:
153:
150:
145:
135:
133:
129:
125:
122:
117:
114:
110:
107:
104:
101:
96:
93:24 April 2007
92:
88:
85:
81:
78:
76:
72:
68:
65:
63:
59:
54:
49:
41:
36:
30:
19:
4559:
4542:
4502:
4494:
4481:
4051:
4046:Gliese 433 b
3822:
3798:
3720:UFO religion
3665:Extremophile
3645:Biosignature
3640:Astroecology
3635:Astrobiology
3587:Great Filter
3402:Project Ozma
3310:Interstellar
3297:
3290:
3268:
3256:Perseverance
3255:
3247:
3177:
3164:
3147:
3140:
3133:
3035:Earth analog
3017:habitability
3000:Life on Mars
2691:
2684:
2683:
2676:
2539:
2535:
2510:. Retrieved
2496:
2485:. Retrieved
2481:the original
2470:
2458:. Retrieved
2449:
2440:
2397:
2393:
2387:
2344:
2340:
2333:
2322:. Retrieved
2318:the original
2308:
2297:. Retrieved
2283:
2240:
2236:
2230:
2219:. Retrieved
2215:the original
2205:
2186:
2143:
2139:
2119:. Retrieved
2115:the original
2105:
2054:
2048:
2003:
1997:
1987:
1942:
1938:
1932:
1881:
1877:
1871:
1859:. Retrieved
1845:
1833:. Retrieved
1822:
1813:
1762:
1756:
1750:
1738:. Retrieved
1729:
1720:
1708:. Retrieved
1697:
1687:
1644:
1638:
1586:
1580:
1574:
1537:
1533:
1523:
1480:
1474:
1468:
1457:the original
1418:
1412:
1383:. Retrieved
1340:
1334:
1278:
1272:
1234:
1228:
1180:
1176:
1165:
1112:
1108:
1060:
1054:
1047:
1004:
1000:
930:
924:
868:
864:
801:
795:
775:the original
736:
732:
675:Earth analog
667:Space portal
630:
623:
613:
611:
587:
580:
572:
569:
541:
539:candidate."
537:ocean planet
525:
521:
495:
486:
478:
453:
449:
445:
438:
430:
421:
405:minimum mass
370:
337:
331:away in the
312:
308:
276:
275:
259:
132:Eccentricity
29:
18:Gliese 581 d
4396:GRB 111209A
4345:WD 0806−661
4323:Discoveries
4117:HD 137388 b
4112:HD 131496 b
4107:HD 100655 b
4052:Gliese 581d
3831:Fobos-Grunt
3655:Exotheology
3467:Grey aliens
3320:Active SETI
3248:Opportunity
3128:BioSentinel
2946:Wow! signal
2895:KIC 8462852
2844:CI1 fossils
2725:- Disproven
2692:Gliese 581f
2685:Gliese 581d
2678:Gliese 581g
2672:Gliese 581c
2667:Gliese 581b
2662:Gliese 581e
2243:: 503–506.
557:temperature
344:super-Earth
329:light-years
323:within the
277:Gliese 581d
33:Gliese 581d
4578:Gliese 581
4567:Categories
4267:Kepler-39b
4262:Kepler-22b
4209:Kepler-16b
4204:Kepler-14b
4102:HD 98219 b
4097:HD 96063 b
4092:HD 85512 b
4087:HD 82886 b
4082:HD 30856 b
4017:Exoplanets
3690:Noogenesis
3670:Hemolithin
3548:Panspermia
3496:Hypotheses
3472:Insectoids
3437:Water hole
2938:SHGb02+14a
2911:VVV-WIT-07
2646:Gliese 581
2512:2017-04-22
2487:2009-09-16
2347:(2): L48.
2324:2009-01-18
2299:2009-01-18
2221:2009-01-18
2146:(2): L48.
2121:2009-04-21
2013:1604.03135
1952:1506.08039
1891:1503.02565
1772:1503.01976
1740:January 7,
1589:(7): 561.
1385:2021-09-17
1190:2407.11520
1122:2201.13342
1115:(4): 169.
1070:1710.01595
1014:1512.00878
804:(7): 616.
701:References
690:Kepler-22b
685:HD 85512 b
615:Doctor Who
460:0.8 d
387:3.6 meter
325:Gliese 581
319:candidate
236:Gliese 581
223:0.19
184:4.19
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4424:SN 2011dh
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4289:LkCa 15 b
4272:Kepler-70
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4167:Kepler-11
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