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98:. Inside an EGG the gas and dust are denser than in the surrounding dust cloud. Gravity pulls the cloud even more tightly together as the EGG continues to draw in material from its surroundings. As the cloud density builds up the globule becomes hotter under the weight of the outer layers, a protostar is formed inside the EGG.
105:. If the protostar has sufficient mass, the density reaches a critical level where the temperature exceeds 10 million kelvin at its center. At this point, a nuclear reaction starts converting hydrogen to helium and releasing large amounts of energy. The protostar then becomes a star and joins the main sequence on the
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showed that only 15% of the EGGs show signs of star-formation. The star-formation is not everywhere the same: The largest pillar has a small cluster of these sources at the head of the pillar.
79:. Dense areas of gas shielded by an evaporating gas globule can be conducive to the birth of stars. Evaporating gas globules were first conclusively identified via photographs of the
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Hester, J. J.; Scowen, P. A.; Sankrit, R.; Lauer, T. R.; Ajhar, E. A.; Baum, W. A.; Code, A.; Currie, D. G.; Danielson, G. E.; Ewald, S. P.; Faber, S. M. (June 1996).
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187:"Hubble Space Telescope WFPC2 Imaging of M16: Photoevaporation and Emerging Young Stellar Objects"
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A protostar may have too little mass to become a star. If so it becomes a
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A study of 73 EGGs in the
Pillars of Creation (Eagle Nebula) with the
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in size, such that gases shaded by it are shielded from ionizing
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71:) is a region of hydrogen gas in outer space approximately 100
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Hydrogen gas region in outer space approximately 100 AU in size
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contain EGGs, leading to the formation of incubating stars.
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http://apod.nasa.gov/apod/image/1207/pillars6_hst_1518.jpg
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Hubble sees stars and a stripe in celestial fireworks
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324:Embryonic Stars Emerge from Interstellar "Eggs"
247:McCaughrean, M. J.; Andersen, M. (2002-07-01).
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237:Windows to the Universe, . Accessed July 2012
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94:EGG's are the likely predecessors of new
249:"The Eagle's EGGs: Fertile or sterile?"
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164:Eric Weisstein's World of Astronomy
52:Knots or globules of denser gas in
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158:Eric W. Weisstein (1996–2007).
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253:Astronomy & Astrophysics
475:Evaporating gaseous globule
235:What happens inside an EGG?
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341:NASA.gov] NASA APODly 2012
284:10.1051/0004-6361:20020589
689:
160:"Evaporating Gas Globule"
134:"Sun's Baby Twin Spotted"
194:The Astronomical Journal
275:2002A&A...389..513M
65:evaporating gas globule
511:Integrated Flux Nebula
89:Hubble Space Telescope
501:Protoplanetary nebula
465:Giant molecular cloud
443:Protoplanetary nebula
521:Post-stellar nebulae
114:Very Large Telescope
612:Intergalactic blobs
577:High-velocity cloud
457:Pre-stellar nebulae
320:Image, July 1, 2008
206:1996AJ....111.2349H
81:Pillars of Creation
32:Pillars of Creation
664:Supernova remnants
560:Interstellar cloud
539:Pulsar wind nebula
166:. Wolfram Research
73:astronomical units
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534:Supernova remnant
506:Wolf–Rayet nebula
433:Reflection nebula
416:Supernova remnant
347:Space, 3/5/2007
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752:Molecular clouds
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619:Lyman-alpha blob
529:Planetary nebula
411:Planetary nebula
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266:astro-ph/0202025
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647:Largest Nebulae
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603:Pinwheel nebula
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570:Infrared cirrus
565:Molecular cloud
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438:Variable nebula
406:Emission nebula
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142:. 5 March 2007.
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330:, Nov. 2, 1995
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304:External links
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259:(2): 513–518.
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214:10.1086/117968
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168:. Retrieved
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85:Eagle Nebula
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36:Eagle Nebula
747:Cosmic dust
470:Bok globule
426:H II region
396:Dark nebula
334:Hubble site
103:brown dwarf
736:Categories
720:Wiktionary
591:Morphology
582:H I region
544:Supershell
328:HubbleSite
120:References
107:HR diagram
96:protostars
34:", in the
652:Planetary
293:0004-6361
222:0004-6256
139:Space.com
91:in 1995.
700:Category
345:NBC News
200:: 2349.
742:Nebulae
710:Commons
674:Related
642:Diffuse
382:Nebulae
271:Bibcode
202:Bibcode
170:14 June
83:in the
77:UV rays
54:SN 1006
666:(SNRs)
660:(PPNe)
553:Clouds
291:
220:
654:(PNe)
634:Lists
261:arXiv
190:(PDF)
30:The "
318:NASA
289:ISSN
218:ISSN
172:2012
314:ESA
279:doi
257:389
210:doi
198:111
69:EGG
63:An
738::
326:,
312:—
287:.
277:.
269:.
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216:.
208:.
196:.
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162:.
148:^
136:.
109:.
374:e
367:t
360:v
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67:(
56:.
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