Astronomy 3.4 Evolution of Stars

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How Stars are formed...

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Temperature at core reaches 15 million k. Fusion starts

Gas cloud begins to collapse and breaks up into protostars

Outward pressure from radiation prevents any further collapse - Main sequence star is formed

Star reaches stable size

Stars are formed from huge clouds of gas and dust called nebulae - Found mainly in spiral arms of Galaxy e.g. Orion’s nebula

Rise in temperature and pressure as GPE (gravitational potential Energy) KE (kinetic energy)


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