Question

Why does the Earth revolve around the sun?

Answer 1

The earth rotates around the sun because of the sun's gravitational pull -- earth keeps moving forward, and the gravitational pull means it rotates around the sun

Answer 2

Newton realized that the reason the planets orbit the Sun is related to why objects fall to Earth when we drop them. The Sun's gravity pulls on the planets, just as Earth's gravity pulls down anything that is not held up by some other force and keeps you and me on the ground.