Why does gravity stop when out of earth's atmosphere?

Gravity does not stop outside the Earth's atmosphere. Gravity's range is theoretically infinite, so you will never be free of its influence. Every object has gravitational attraction for every other object in the universe.

The force of that attraction is greater for objects with greater amass, and is gets less as the distance between the two increases. The only way to not notice gravity's influence is to be in free fall. They you don't have anything opposing your movement toward the large attracting object (the earth) and you don't feel the attraction (the weight).

As such weightlessness is experienced by astronauts in a spacecraft in orbit, so it is in free fall.

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