Answer: The planets in our solar system have to orbit the sun because of gravity and the heat because if we didn't have the sun we would all freeze to death or die from no oxygen and the sun helps the planets stay in orbit and gravity
Explanation: the basic reason why the planets revolve around, or orbit, the Sun, is that the gravity of the Sun keeps them in their orbits. Just as the Moon orbits the Earth because of the pull of Earth's gravity, the Earth orbits the Sun because of the pull of the Sun's gravity.