If we throw any object up in the sky, where will it finally go? It comes towards the surface of the Earth. The earth pulls every objects towards its center. That is why every object thrown up in the sky comes towards the surface of the Earth.
The force with which any massive body pulls an object towards its center is called gravity
Just like the Earth, all planets and satellites have their own gravity. The gravity of a big mass is lager and gravity of small mass is small. gravity of the Moon is only about one sixth of the gravity of the Earth. Gravity of Jupiter is more than that of the Earth.
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