Question

Why does Newton's law of universal gravitation apply to all objects in the universe? Explain.

Answer 1

because gravity pulls everything down like when you jump in the air you fall right back down.

Answer 2

Newton's law of Universal Gravitation tells that Force between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.

As there is mass for every object, and they are separated by certain distance (from 1 cm to more than hundreds of light years), they exerts Gravitational force on each other

Hope this helps!