E5

Describe the conditions that initiate fusion in star:
Stars are formed when large clouds of gas and dust are compressed. The cannot form on their own because the gravitational force is not big enough to pull the particles together. A large supernova or a collision with another star will cause the process to occur.


State the effect of a star's mass on the end product of a nuclear fusion:

• A star will eventually start fusing helium and hydrogen will become rare.
  • Fusion reactions will then happen less often The core of the star will begin to collapse as the star is no longer in equilibrium.The collapse of the star increases its core temperature. Because of the higher pressure and temperature 
• • in the core helium fusion is now possible
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