The force of Gravity.
Gravity
Flying Saucers from Outer Space was created in 1953.
The force of gravity between the moon and the planet is what keeps the moon in orbit around the planet. This gravitational force prevents the moon from floating away into space and keeps it in a stable orbit.
Gravity keeps stuff on Earth!
The gravity of the sun an each moon's respective planet keeps them from flying into space.
From flying saucers!!
we can't fly or float on earth because of gravity. Gravity keeps us from flying, floating, and falling of of the earth. In outer space it is different only because ther is no gravity in outer space and if there was the planets would most likely end up falling or we wouldn't be able to float in outer space anymore. But gravity is the main thing that keeps us on the ground!!! We can't feel gravity but that doesn't mean that it doesn't exist.
Gravity
The Sun's Gravitational pull keeps the planets orbiting it, not flying into deep space.
Well, to tell the truth, everything inside a galaxy is actually flying off in space. Everything that is anything is flying off in space. Space is the thing that everything is in. What does tend to keep things together is gravity. So as things inside a galaxy are flying around in space, gravity keeps them from flying off in their own direction.
gravitational force
An astronomer.