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star life cycle

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by

Christopher Cole

on 8 January 2013

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Transcript of star life cycle

life cycle nebula -mixture of hydrogen and helium
and some dust and plasma
-nebulae most often form when a
white dwarf or a giant star
go supernova
-they also form when dust and gas
becomes dense enough to feel
the pull of gravity
-reflection nebulae
-dark nebulae
- https://sites.google.com/site/coolspacefacts/facts-about-nebulas

http://www.houseandhome.org/facts-about-a-nebula protostar -does not shine yet
-loose mass
-will shrink to 1/3 its size when it
moves to the next stage
-it begins the process of nuclear
fusion and becomes a... Red Giant Star Like the Sun (main sequence) most of the stars in our galaxy are main sequence
they are mostly made up of hydrogen and helium
they get their spherical shape from the gravitational force to the center and the outward force from the fusion reaction
the smaller cooler stars last longer than the larger hotter stars http://scienceforkids.kidipede.com/physics/space/mainsequence.htm a main sequence star becomes a red giant when the core of the star begins to contract
the temp. begins to rise
not all stars will become red giants
only stars .5-6x's the size of the sun
the sun is supposed to become one in about 5 billion years Planetary Nebulae survive for 25,000 to 100,000 years
form when the nuclear fuel has been exhausted
these are not planetary at all
the dot in the center is a star not a planet white dwarf the center of a planetary nebula is a white dwarf
they have densities of up to 1,000,000 times that of water
they have low luminosity This is the white dwarf that will be left behind when the sun collapses http://scienceblogs.com/startswithabang/2012/01/12/did-this-supernova-leave-nothi/ citations http://chandra.harvard.edu/xray_sources/white_dwarfs.html stars are born and age and then they die OVERVIEW they are alot like a living thing
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