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most stars you see in the sky are main-sequence stars because stars spend most of there life time as a main secuence stars then they turn into red giants and enggulp the inner planets blow off there outer layer and become white dwarf the will eventually die and give off huge clouds off gas and will become a new star.

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16y ago
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8y ago

Red giant stars emit about the same amount of light per square meter as red main sequence stars do. However, red giants are much larger than red dwarfs and so emit light from a much larger surface, making them brighter overall.

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9y ago

The majority of a star's active lifetime is spent on the Main Sequence, with only about 1% of the star's lifetime spent as a red giant . Hence, there will be fewer red giants seen, because it is a relatively brief period for the star.

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9y ago

Short answer ... because the Universe is still fairly young.

The main sequence consists of the stars that convert energy by fusing hydrogen-1 to helium-4. Once the star basically runs out of this fuel, it will start converting helium-4 to heavier elements - and will no longer be on the main sequence. Most stars didn't have the time yet to run out of their hydrogen fuel. Only a relatively small amount of very massive stars have run out of hydrogen.

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9y ago

Red giants are much brighter than red main-sequence stars, so they are a lot higher up the HR diagram.

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Q: Why are most stars you see in the sky main-sequence stars?
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