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An island comprising billions of stars and nebulae, held together by gravity.
Gravity holds the planet together as a 'ball' and you on it. It also makes things fall. We can measure this so we know the force of gravity on earth and can calculate it for other planets and stars.
gravity
Yes. Stars form when clouds of gas and dust, called nebulae, collapse under the force of gravity.
A system of billions of stars held together by gravity is called a galaxy. The one we live in is called the Milky Way galaxy.
Galaxy
The answer is simple: gravity.
That is a galaxy.
a galexy
An island comprising billions of stars and nebulae, held together by gravity.
Planets and stars have gravity.
Because of gravity. Only gravity can pull large clouds together with enough force to overcome gas pressure.
Scientists don't "think" it was gravity, scientists know that it was gravity.
Gravity is the force that causes stars to be created
Galaxy
If they form a galaxy, it's called a galaxy of course.
Gravity.