jonnromeroo
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Which of the following processes begins when a star enters the main sequence?

Nuclear fission
Nuclear fusion
Condensation of a nebula
Appearance of a supernova

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QamartheMoon

Hello there Jonnromeroo, thank you for asking a question here on Brainly!

You Asked ➤ Which of the following processes begins when a star enters the main sequence?

↴ OUR CHOICES ↴

A: Nuclear fission

B: Nuclear fusion

C: Condensation of a nebula

D: Appearance of a supernova

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Answer ➤ B: Nuclear fusion

Explanation: When a star begins the process of being created, it is hot and dense. Really hot and dense! It begins to start fusing with helium which is the start of its main sequence called nuclear fusion.

I hope this answer is helpful to you, but please let me know if you have any other questions regarding it.  

- Qamar  

pristina

Answer:

Nuclear fusion is a correct option

Explanation:

Nuclear fusion processes begin when the star enters the main sequence.

Nuclear fusion: by which energy is produced by the star,the star become the main sequence star and it gets turned on.

Formation of a star takes place when it is very hot, hydrogen atom fuse to form helium in the core region,and energy is released by the fusion process and star enters the main sequence by the processes nuclear fusion.

This fusion results in outward pressure which balances the inward pressure, which is caused by gravity and thus stabilizes the star.

Thus Nuclear fusion processes begins when a star enters the main sequence.

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