Why are stars called main sequence?

Answer 1

They follow the trend line on the Hertz-Russell Diagram.

These are Hertzsprung-Russell Diagrams (HR Diagrams). The HR Diagram plots a star's luminosity (how bright it is) against how hot its surface is, using the sun as a base for luminosity.

The diagram below plots some well know stars on the sequence.

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Answer 2

Stars are called main sequence because they predominantly spend the majority of their lifetime in this stable phase, during which they fuse hydrogen into helium in their cores.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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