If it weren't for newton's law, regarding inertia, the planets would travel in a straight line into space. gravity is the outside force that keeps the planets in orbit about the sun. first second third

Label the following as inner or outer planets; a) has 67 moons made mostly of hydrogen and helium b) has rings c)no moons, high volcanic activity d) known as the red planet, has 2 moons e) very thin atmosphere, moons or rings