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Space Physics (Formation of the Solar system (The sun was formed from a…
Space Physics
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Life Cycle of a Star
All stars go through a life cycle that is determined by the size of the star
1) Small stars, like the sun end up like black dwarf stars
2) Larger stars become neutron stars
3) The largest stars become black holes.
All stars begin in the same way as our sun did - clouds of dust and gas are drawn together by gravity to form a protostar and eventually a main sequence star.
During the main sequence, hydrogen fuses together to create helium and, in large stars lithium.
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As the star ages:
1)More and more of its mass is converted into energy by nuclear fission.
2)As the mass decreases, the outward forces become larger than the force of gravity.
3) The star then expands and cools becoming a red giant or red supergiant.
4) As the star cools and the hydrogen fuel is used up, the outward forces are reduced.
5) The star collapses onwards due to gravity and this causes it to increase in temperature once more.
6) It begins to fuse helium and lithium.
The largest stars explode as supernovas , releasing tremenndous amounts of energy and scatering the material of the star into space
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