They aren't. Stars form as a result of a cloud of gas collapsing due to gravity.
stars are massive luminous ball of plasma that is held together by gravity
Stars in the universe twinkle because of refraction not gravity.
yes because they levitate in space gravity does hold stars up
Gravity keeps the planets in orbit around the sun and the stars and the stars in orbit around the center of the galaxy. Gravity also holds the stars together against their own internal pressure.
Planets and stars have gravity.
There is gravity. There is gravity on all planets, moons, and stars.
The answer is simple: gravity.
Stars want to expand when they are active, but their high gravity keeps them the right size. When stars are too old they stop expanding, and its gravity makes it very small. If an object has too much mass for its size, it is a black hole.
Gravity doesn't just "affect" the formation of stars; it's just about the only force that CAUSES the stars to form in the first place.
Yes. Stars form when clouds of gas and dust, called nebulae, collapse under the force of gravity.
Galaxies are made up of billions of stars, along with gas, dust, and dark matter. These components come together to form vast systems that are bound together by gravity.
Because stars have a greater amount of gravity