How are Stars Formed

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How are Stars Formed?
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What is a Star?

• A Star is Celestial body of hot gases that
  radiates energy derived from thermonuclear
  reactions in the interior.

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How are Stars formed?

• Cloud of cool gas
• Dense molecular gas
• Clouds collapse and increase in density

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How are Stars formed?

• Either
• It can collide with another cloud
• It can encounter the pressure caused by a giant
  supernova.
• Several stars can be born at once
• Heat energy comes from the mutual gravity

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How are stars formed?
Extreme Temperature
CNO Cycle
Large
Protostar
Medium
P-P Cycle
High Temperature
Small
No star formed
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How do we know?

• Visual light telescopes
• Limited views
• Restricted distance
• The wavelength of light

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How do we know? Part 2

• Young stars emit ionised stellor winds
• Merlin network

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Brown Dwarf
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White Dwarf
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Neutron Star
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Black Hole
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Supernova