Birth and Death of a Star and planetary systems

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Birth and Death of a Starand planetary systems

• Weve got the Hydrogen and Helium, now lets turn
  them on and let them Go!

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Cosmic Abundances

• Hydrogen
• 80
• Helium
• 20
• Lithium
• Trace
• Beryllium
• Trace

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All that gas

• Anything with mass has gravity
• Clumps of gas (the Big Bang wasnt exactly
  smooth) began to fall together

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• Dust and gas region The Horsehead Nebula (in
  Orion)

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• Dust Clouds with stars forming inside

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• Dust around a star a solar system forms

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• Proto- planetary disks - stars forming planets
• In M42

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• The disk flattens, gas and dust comes together.
  The star is ON

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Star Birth behind dust M42
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• Once they turn on, stars push the gas and dust
  away.

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• Same beginnings different focus
• Lets do a short focus on the planetary system
  formation.
• Well be discussing the planets in more depth
  later.

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The Condensation Sequence
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• Radar study of an asteroid going by.

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