In our solar system, Earth is the only planet with life. Earth and has one moon, a giant star called the sun which all the planets revolve around. In addition, our solar system has 9 planets including Earth. All have no life except Earth. All the planets revolve around the sun. Earth rotates on a tilt, and it spins on its axis. Mars is the planet we know most about because scientist have sent rovers to the planet. The rovers have special cameras in them that scientist watch from Earth. Pluto is the smallest and farthest away from the sun. So far, scientist believe that Pluto is no longer a planet because it is too small and too far to be considered a planet.