Question

Define the life cycle of a star?????​

Answer 1

Answer:

Life Cycle of a Star. Stars are formed in clouds of gas and dust, known as nebulae. ... Eventually, however, the hydrogen fuel that powers the nuclear reactions within stars will begin to run out, and they will enter the final phases of their lifetime.

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Answer 2

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.....A star is born once it becomes hot enough for fusion reactions to take place at its core. Stars spend most of their lives as main sequence stars fusing hydrogen to helium in their centres. The Sun is halfway through its life as a main sequence star and will swell up to form a red giant star in around 4.5 billion years.

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