684:
69:
696:
31:
57:
648:
672:
660:
42:
151:
614:"'Mini-Neptunes' beyond solar system may soon yield signs of life – Cambridge astronomers identify new hycean class of habitable exoplanets, which could accelerate search for life"
613:
716:
117:
139:
161:
638:
352:
A hot, water-covered planet with a hydrogen-rich atmosphere that is possibly capable of harboring extremophilic life.
155:
529:
381:
373:
35:
367:
683:
41:
585:
548:
481:
280:
133:
85:
112:, and speculation has included different kinds of stars, planets, and other astronomical objects.
688:
676:
566:
538:
214:
108:
Hypothetical astronomical objects have been speculated to exist both inside and outside of the
68:
505:
497:
244:
123:
652:
556:
489:
327:
222:
89:
77:
49:
424:
391:
256:
145:
552:
485:
700:
590:
418:
411:
299:
planet where uneven heating of the surface induces spatial features resembling a human
290:
262:
710:
570:
405:
322:
308:
296:
270:
248:
208:
61:
30:
695:
664:
618:
357:
109:
97:
17:
523:
Madhusudhan, Nikku; Piette, Anjali a. A.; Constantinou, Savvas (26 August 2021).
228:
129:
73:
45:
561:
524:
100:", around which he proposed other celestial bodies (including the Sun) moved.
501:
386:
A planet that was originally a moon but has become gravitationally detached.
150:
For stars, planets or moons whose existence is not accepted by science, see:
469:
314:
152:
Planetary objects proposed in religion, astrology, ufology and pseudoscience
93:
509:
56:
493:
435:
A planet with significant amount of strong acids, including sulfuric acid
240:
231:
whose outer layers have been completely stripped off by its parent star.
190:
470:"The potential feasibility of chlorinic photosynthesis on exoplanets"
198:
144:
For extrasolar moons, all of which are currently hypothetical, see:
659:
543:
397:
67:
55:
40:
29:
116:
For hypothetical astronomical objects in the Solar System, see:
96:
defined a hypothetical astronomical object which he called the "
342:
300:
64:. The surface is dark and reddish from hydrocarbon deposits.
362:
A planet whose surface is covered entirely by deep oceans.
336:
339:
92:. For example, in the 5th century BCE, the philosopher
456:
Distinguished
Figures in Mechanism and Machine Science
285:
A planet that is located outside the Milky Way galaxy
636:
333:
330:
217:composed primarily of carbon, rather than silicon.
27:
Astronomical bodies believed or speculated to exist
172:Hypothetical types of extrasolar planets include:
525:"Habitability and Biosignatures of Hycean Worlds"
586:"Hycean planets might be habitable ocean worlds"
317:composed mainly of helium instead of hydrogen.
275:A terrestrial planet with little to no water.
8:
203:A planet that directly orbits a black hole.
261:A terrestrial planet that has no metallic
239:A planet with significant amounts of free
160:For hypothetical planets in fiction, see:
104:Types of hypothetical astronomical objects
560:
542:
118:List of hypothetical Solar System objects
174:
52:initially mistaken for a moon of Mercury
34:Artist's concept of Earth, orbited by a
643:
584:Anderson, Paul Scott (29 August 2021).
447:
193:. May have lakes or oceans of ammonia.
189:A planet with significant amounts of
162:Fictional planets of the Solar System
7:
138:For hypothetical black holes, see:
468:Haas, Johnson R. (November 2010).
372:A terrestrial planet that is more
88:have been hypothesized throughout
25:
717:Hypothetical astronomical objects
396:A planet whose shape resembles a
694:
682:
670:
658:
646:
612:Davis, Nicola (25 August 2021).
326:
410:A planet that orbits near the
1:
122:For hypothetical stars, see:
733:
427:of a more massive object.
156:Stars proposed in religion
530:The Astrophysical Journal
168:Hypothetical planet types
562:10.3847/1538-4357/abfd9c
382:Tidally detached exomoon
36:hypothetical second moon
140:Hypothetical black hole
72:Artist's conception of
81:
65:
60:Artist's concept of a
53:
38:
494:10.1089/ast.2009.0364
368:Superhabitable planet
80:, transiting its star
71:
59:
44:
33:
281:Extragalactic planet
134:List of brown dwarfs
86:astronomical objects
553:2021ApJ...918....1M
486:2010AsBio..10..953H
18:Hypothetical planet
454:Marco Ceccarelli,
215:terrestrial planet
82:
66:
54:
39:
439:
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432:Vitriolic planet
245:hydrochloric acid
128:For hypothetical
124:Hypothetical star
16:(Redirected from
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349:
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223:Chthonian planet
175:
90:recorded history
84:Various unknown
78:Chthonian planet
50:eclipsing binary
21:
732:
731:
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591:Earth & Sky
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467:
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458:(2007), p. 124.
453:
449:
444:
425:Lagrange points
422:
415:
392:Toroidal planet
329:
325:
257:Coreless planet
236:Chlorine planet
186:Ammonia planet
170:
146:Extrasolar moon
106:
28:
23:
22:
15:
12:
11:
5:
730:
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719:
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604:
576:
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480:(9): 953–963.
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364:
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297:tidally locked
293:
291:Eyeball planet
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26:
24:
14:
13:
10:
9:
6:
4:
3:
2:
729:
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464:
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457:
451:
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434:
431:
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416:
409:
407:
406:Trojan planet
404:
403:
400:or doughnut.
399:
395:
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385:
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380:
379:
375:
371:
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366:
365:
361:
359:
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347:
324:
323:Hycean planet
321:
320:
316:
312:
310:
309:Helium planet
307:
306:
302:
298:
294:
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289:
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284:
282:
279:
278:
274:
272:
271:Desert planet
269:
268:
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255:
254:
250:
249:muriatic acid
246:
242:
238:
235:
234:
230:
226:
224:
221:
220:
216:
212:
210:
209:Carbon planet
207:
206:
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200:
197:
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185:
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173:
167:
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137:
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113:
111:
103:
101:
99:
95:
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79:
76:, a possible
75:
70:
63:
62:carbon planet
58:
51:
48:, a possible
47:
43:
37:
32:
19:
623:. Retrieved
619:The Guardian
617:
607:
595:. Retrieved
589:
579:
534:
528:
518:
477:
474:Astrobiology
473:
463:
455:
450:
376:than Earth.
358:Ocean planet
181:Description
171:
130:brown dwarfs
110:Solar System
107:
98:Central Fire
83:
689:Mathematics
677:Outer space
625:12 December
597:12 December
229:hot Jupiter
74:HD 209458 b
46:31 Crateris
544:2108.10888
442:References
653:Astronomy
571:237290118
502:1557-8070
374:habitable
315:gas giant
94:Philolaus
711:Category
537:(1): 1.
510:21118026
241:chlorine
701:Science
639:Portals
549:Bibcode
482:Bibcode
191:ammonia
132:, see:
569:
508:
500:
199:Blanet
665:Stars
567:S2CID
539:arXiv
398:torus
178:Type
627:2021
599:2021
506:PMID
498:ISSN
263:core
247:and
154:and
557:doi
535:918
490:doi
417:or
301:eye
243:or
713::
616:.
588:.
565:.
555:.
547:.
533:.
527:.
504:.
496:.
488:.
478:10
476:.
472:.
343:ən
337:aɪ
313:A
303:.
295:A
265:.
251:.
227:A
213:A
641::
629:.
601:.
573:.
559::
551::
541::
512:.
492::
484::
421:5
419:L
414:4
412:L
346:/
340:ʃ
334:h
331:ˈ
328:/
20:)
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