The basic reason why planets orbit or orbit the sun is because the sun's gravity "holds" the planets in their orbits. Just as the moon revolves around the earth by the gravity of the earth, the earth revolves around the sun by the gravitational force of the sun.
The basic reason why planets orbit or orbit the sun is because the sun's gravity "holds" the planets in their orbits. Just as the moon revolves around the earth by the gravity of the earth, the earth revolves around the sun by the gravitational force of the sun.