I am the Sun. I'm a burning ball of fire. I'm very big indeed. Life on earth depends on me. I am the Sun. I am Mercury. I'm the closest planet to the Sun. I'm a ball of iron -- I have no moons. I am Mercury. I am Venus. I'm the same size as the Earth but I spin the other way and much more slowly. I have no water -- I am Venus. I am the Earth....Learn More