star formation. 1) nebula cloud of interstellar gas and dust collapses due to its own gravity ...
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STELLAR EVOLUTION
Star Formation
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1) Nebula
Cloud of interstellar gas and dust Collapses due to its own gravity Begins Star Formation
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2) Protostar
Rotating disk shape Hot condensed object at the center Fusion begins
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3) Main Sequence Star
Fusing Hydrogen into Helium Longest phase of Sun’s Lifecycle
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4) Red Giant
Sun expands beyond Venus’ orbit
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5) Planetary Nebula
Outer layer of Star is driven off
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6) White Dwarf
No longer Nuclear Supported by resistance of electrons
being squeezed together
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7) Black Dwarf
Sun runs out of energy
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Massive Stars
1) Nebula
2) Protostar
3) Main Sequence Star
4) Several Red Giant PhasesUntil iron has formed
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Neutron Star
Extremely dense – 100 trillion times more dense than water
Very Small – a radius of approx. 10 km
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Supernova
Massive explosion that blows off outer portion of neutron star
http://www.youtube.com/watch?v=0J8srN24pSQ
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Black Hole
Only the most massive stars (20 times the size of the Sun)
Collapse of star continues forever Gravity so strong that light cannot
escape
http://www.youtube.com/watch?v=f_KLOFe2rDY