Life cycle of stars

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4 Terms

1
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Stars may originate as a nebula. (i) Describe the process that then occurs to produce the conditions necessary for nuclear fusion in a new star.

A nebula collapses under gravity, and reaches very high temperatures and pressures.

2
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State how the brightness of a main sequence star changes with its temperature.

The higher the brightness, the greater the temperature.

3
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State how the brightness of a main sequence star changes with its mass.

The greater the mass, the higher the brightness.

4
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A nebula may evolve into a main sequence star, such as the Sun. Explain how a nebula may evolve into a main sequence star.

The cloud of dust and hydrogen gas, a nebula, is pulled inwards, towards each other due to gravititional force.