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Name: Sharalyn
Status: other
Grade: other
Location: NV
Country: N/A
Date: N/A

Why do we have stars in are universe?


Stars (and our Sun) are the result of matter being attracted to each other. Imagine that in the early history of the universe, there were just atoms. Since space is essentially frictionless, these atoms move around freely. Now some atoms might come into contact with each other and they might stick because electromagnetic forces tend to allow atoms to stick to each other. If enough of these atoms adhere to each other, then they will develop enough mass to have a measurable gravity. The gravitational forces are very long ranged so that clump of atoms will now start attracting other clumps of atoms until a big mass is developed. If the mass is mostly gaseous hydrogen and helium (the very first atoms) and the mass gets big enough, the gravitational force of all that mass going inward will start the nuclear reaction that causes stars to emit heat and light. You can imagine that this can happen anywhere in the universe where there are lots of these gases clumping together. And so we see stars.

Greg (Roberto Gregorius)

Dear Sharalyn,

We have stars because that is the most natural way or galaxies and the universe to be. Matter gets formed and immediately tries to galvanize in the simplest way possible. So with the help of gravity, matter (hydrogen at first) gathers together and is held together by gravity to form stars.

David Levy

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