Birth of a star
Lesson 7 / 7
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I can describe what a star is and how it forms.
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The Sun is a medium sized star that emits radiation as a result of nuclear fusion reactions in its core.
A star is formed from a cloud (nebula) of dust and gas pulled together by gravitational attraction.
Dust in a nebula is any sort of fine particle, such as specks of rock, and most of the gas in space is hydrogen.
As a star forms, dust and gas accelerate towards its centre over a very long time, creating very high temperatures.
A star forms when hydrogen nuclei in a protostar fuse together converting mass into gamma radiation that causes heating.
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