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A star with a mass of 2solar masses, 2times the mass of the sun, would have a main-sequence stage of half the life of a star with the mass of our sun. More massive stars die faster, less massive stars live longer and therefore have longer main-sequence stages.

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Is the main sequence lifetime of a low mass star the same as the lifetime of the sun?

No. The less massive a star, the longer it will last. A main sequence star half the mass of the sun can be expected to last about 5 times longer.


Which kind of star is most likely to spend the longest time on the main sequence?

Low-mass stars, like red dwarfs, are likely to spend the longest time on the main sequence due to their lower energy consumption and slower nuclear fusion processes. These stars have the longest lifespans because they burn their fuel at a slower rate compared to more massive stars.


Does a low mass or high mass sequence star have higher fusion rate during main sequence life?

A high mass star. The temperature and density of the stars core are at the levels necessary to sustain the energy production that supports the remainder of the star. A reduction of energy production would cause the overlaying mass to compress the core, resulting in an increase in the fusion rate because of higher temperatures and pressure. Likewise, an increase in energy production would cause the star to expand, lowering the pressure at the core. Thus the star forms a self regulating system in hydrostatic equilibrium that is stable over the course of its main sequence lifetime The most massive stars may remain on the main sequence for only a few million years, while smaller stars may last for over a trillion years. See link for detailed information. See related questions for an overview.


What percent of the stars are considered part of the main sequence?

Approximately 90% of stars are considered to be part of the main sequence. These are stars that are fusing hydrogen into helium in their cores, like our Sun. The main sequence is a stable period in a star's life cycle that can last for billions of years.


How long is the sun going to last?

The sun is expected to last for another 5 billion years. It is currently in the middle of its main sequence phase, which is the longest phase in its life cycle.

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No. The less massive a star, the longer it will last. A main sequence star half the mass of the sun can be expected to last about 5 times longer.


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