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THE LIFE OF A STAR http://hubblesite.org/newscenter/archive/releases/nebula/2004/26/
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What will determine how a star lives out its life? ( Examine the diagram.) How much mass a star has. What is mass? How much matter is present in a given object.
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(A) First Contraction: Gravity pulls together gas and dust which eventually forms a stable star.
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(1) Nebula (http://www.meade.com/gallery/images/orion_nebula.jpg)
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Nebula: A cloud of gas and dust where stars are born!
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(2) Protostar http://physics.ship.edu/~mrc/pfs/108/node3.htm
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Protostar: The first star formed where fusion begins and energy is radiated outward.
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Fusion: The combining of two atomic nuclei which produces large amounts of energy/heat. Example: hydrogen + hydrogen = helium + energy
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(3) Main Sequence http://physics.ship.edu/~mrc/pfs/108/node3.htm
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Main Sequence Star: A middle-aged stable star which uses hydrogen as a fuel source. Example: The Sun
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http://physics.ship.edu/~mrc/pfs/108/node3.htm
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(B) Second Contraction: The outflow of energy from the fusion of hydrogen is less than the gravity keeping the star together.
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(C) Expansion: The star starts to fuse helium and this creates the release of energy which is greater than the force of gravity.
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(4) Red Giant
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Red Giant http://wonderquest.com/images/2005-03-10-red-giant-star.jpg
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Red Giant: A large, bright, cool star which uses helium as a fuel source.
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(D,E,G) Third Contraction The supply of helium is depleted which causes the force of gravity to be greater than the energy released from the star due to fusion.
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If the amount of matter in the star is average (up to 8 times the Sun’s mass),it will follow Path #1 to form a White Dwarf (5). A White Dwarf: a small,dim,hot star. A White Dwarf will eventually burn out and form a Black Dwarf (6).
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White Dwarf http://www.astronomy.mps.ohio-state.edu/npogge/Ast162/unit3/extreme.html
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http://leonatopo.splinder.com/archive/2005-12
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Nova: A star that changes in brightness and has an explosion which removes some of its outer layers.
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If a star is more massive than the sun ( 8 to 20 times greater ),during the 3 rd Contraction, the outer layers will violently explode and implode, throwing matter into space as well as creating a dense core. This phenomenon is called a: Supernova (F,H).
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Supernova http://historyoftheuniverse.com/hotuwiki/index.php/Supernovahttp://historyof
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Supernova: A violent explosion which occurs within the outer layers of a massive collapsing star which throws matter into space as well as implodes matter into the middle forming a dense core.
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The end result: A Neutron Star (7)
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Neutron Star http://solarsystem.nasa.gov/multimedia/gallery/neutron.jpg
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Neutron Star: A star that forms from a collapsed star which had 8 to 20 times the mass of our Sun.
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Neutron Star – Pulsar http://stardate.org/images/gallery/neutron_star.jpg
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If the star is an extremely massive star (greater than 20 Sun masses), during the 3 rd Contraction, a supernova will occur which will create a collapsed star so dense, visible light will not be able to leave its gravitational pull. This is called a --?
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Black Hole (8) http://brokekid.net/img/blackhole.jpg
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Black Hole: A collapsed star so dense that visible light cannot escape its gravitational pull.
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