life cycle of a star by jackie822 and beanerbutt777
TRANSCRIPT
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Life Cycle of A Star
By Jackie822and
Beanerbutt777
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The Life Cycle of
Small and Medium Sized Stars
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The First Stage: The Nebula
http://rigel.csi.cuny.edu/rowan/lectures/Hubble%20Nebulae_files/HelixNebula-HST.jpg
A n The nebula is a cloud of gas and dust. It is not yet a star.
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The Protostarhttp://www.williamsclass.com/EighthScienceWork/ImagesEighth/Protostar.jpg
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Brown DwarfA brown dwarf occurs if the protostar is too small to ignite fusion.
http://chandra.harvard.edu/photo/2003/twa5b/twa5b_dwarf_ill.jpg
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Main Sequence
http://www.astronomyexpert.co.uk/images/9392.jpg
A protostar gets enough mass to ignite fusion. All main sequence stars fuse hydrogen. Stars spend most of their life in the main sequence stage.
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Red Giant
http://home.comcast.net/~van.etten/Support/Red%20Giant.jpg
A red giant is formed when a small to medium sequence star runs out of hydrogen and begins fusing helium.
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Planetary Nebula
http://rigel.csi.cuny.edu/rowan/lectures/Hubble%20Nebulae_files/HelixNebula-HST.jpg
A red giant completely stops fusing helium and the outer layers of the star are driven away.
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White Dwarf
http://www.nasa.gov/centers/goddard/images/content/207358main_whitedwarf_20080102_HI1.jpg
White Dwarf
The white dwarf is the leftover core of a star. It is extremely dense. It may be the size the earth but has half the weight of the sun.
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Black DwarfA white dwarf cools off after trillions of years and eventually stops emitting light.
http://library.thinkquest.org/3103/nonshocked/topics/blackdwarfs/images/blackdwarfimg.gif
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The Life Cycle Of
Massive Stars
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The NebulaThe Nebula is a cloud of dust and gas.
http://rigel.csi.cuny.edu/rowan/lectures/Hubble%20Nebulae_files/HelixNebula-HST.jpg
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Protostarhttp://rigel.csi.cuny.edu/rowan/lectures/Hubble%20Nebulae_files/HelixNebula-HST.jpg
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Massive Main Sequence
https://segue.atlas.uiuc.edu/uploads/ryemm2/blue%20main%20sequence.jpg
Massive main sequence stars burn more quickly than small to medium mass main sequence stars because they fuse more hydrogen.
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Red Super GiantRed SUPERGIANT
http://solarsystem.nasa.gov/multimedia/gallery/prominence.gif
Red Super giants occur when massive main sequence stars run out of hydrogen and start fusing helium, carbon, oxygen, etc.
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SUPERNOVA!
http://d21c.com/sookietex/space_supernova.jpg
When fusion stops, the star collapses and creates a huge explosion.
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Neutron Star
http://media.arstechnica.com/journals/science.media/neutron_star.jpg
The super dense core left over after a supernova is called a neutron star.
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Black HoleBLACK HOLE
http://startswithabang.com/wp-content/uploads/2008/05/ashtekar_blackhole.jpg
Stars with masses 25-50 times the mass of the sun form a black hole after the supernova. Other stars turn into Neutron Stars. Nobody knows what happens to things after they go into a black hole.
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Fin.The End.