Question

The earth is acted upon by gravitation if sun even though it doesn't fall into the sun. Why?

Answer 1

The gravitation force of sun acts as a centripetal force due to which earth moves in a uniform circular motion around it.
hope dis helps u..

Answer 2

Earth does not fall into Sun because earth keeps revolving around Sun. This creates a centripetal force that pulls earth away from the Sun. When this force is equal the gravitational attraction, earth becomes stable. That is, it never falls into Sun, nor she leaves the Sun.

This is the same reason why satellites do not fall into earth.