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From birth … to death…. Star Life Cycle. Nebula. A huge cloud of dust and gas (mostly hydrogen) pulled together by gravity Called the “birthplace of a star” Theory is that the dust came from the explosions of other stars. Nebulae Examples…. Protostar.

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From birth to death

From birth… to death…

Star Life Cycle


Nebula
Nebula

  • A huge cloud of dust and gas (mostly hydrogen) pulled together by gravity

  • Called the “birthplace of a star”

  • Theory is that the dust came from the explosions of other stars


Nebulae Examples…


Protostar
Protostar

  • Gravity causes the particles of gas and dust to move together

  • Temperature and pressure increase and the cloud begins to spin


Star

  • The protostar continues to contract due to gravity

  • Temperature and pressure continue to increase

  • When temperature reaches 10 million degrees Celsius, nuclear fusion begins


Nuclear fusion
Nuclear Fusion

  • At temperatures of 10 to 15 million degrees Celsius, nuclear fusion occurs in stars

  • Hydrogen are converted into one helium plus a lot of energy!


Main sequence stars type of star depends upon mass
Main Sequence Stars(type of star depends upon mass)



Star death
Star Death

  • Death is determined by mass. When the last of helium atoms in the core are fused into carbon atoms, the star begins to die.

  • A sun-sized star will first expand to a red giant, then collapse on itself to become a white dwarf.


Massive star death
Massive Star Death

  • Energy is released in a powerful explosion called a supernova

  • It then becomes a neutron star. No nuclear fusion is taking place to support the core, so it is swallowed by its own gravity.


Black holes
Black Holes

Only a very massive star can become a black hole, which is not visible and is so dense nothing can escape.


Some media
Some media

  • http://science.discovery.com/video-topics/space-videos/supermassive-black-holes-the-black-hole.htm

  • http://www.space.com/15421-black-holes-facts-formation-discovery-sdcmp.html



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