> The thing that keeps them in "space" is the acceleration with which they were originally launched to orbit the Earth, which slows down such falling process.

> The thing that keeps them in "space" is the acceleration with which they were originally launched to orbit the Earth, which slows down such falling process. It would be more clear to say that what keeps them in space is that they're moving sideways so fast. Velocity, not acceleration, is the right term here.