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Why are stars so large?
I would say that's a result of a tendency of masses to group together, as a result of the gravitational force. Also, the heat and the corresponding pressure inside a star keep them from collapsing - as long as they have fuel to burn.
Asked in Planetary Science, Stars
Why do small-mass stars have longer lifetimes than large-mass stars?
Asked in Planetary Science
What is a large cool star formed when a star runs out of hydrogen is a?
Asked in Astronomy, Clouds, Planetary Science
Why do billions of stars appear as clouds or patch of light?
Asked in Astronomy, Planetary Science
Why does the sun appear so large in our bright sky?
Asked in Science
What is the life span of stars?
billions of years It varies, though depending on how large or small the star is when it forms. Large stars have shorter lifetimes, in the hundreds of millions of years. Small stars have longer lifetimes, tens of billions of years. This seems contradictory, but what happens is that the centers of large stars are compressed more because of the large amount of gravity. This causes the nuclear reactions that power the stars to proceed much more rapidly. Hence, in spite of the greater amount of material in a large star, the large stars burn out more quickly.