PLANETS

[1] The eight planets are: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Under this definition, the Solar System is considered to have eight planets. ... Minor planets and comets, including KBOs [Kuiper belt objects], differ from planets in that they can collide with each other and with planets."

Mercury is hot, but not too hot for ice. ...Venus doesn't have any moons, and we aren't sure why. ...Mars had a thicker atmosphere in the past. ...Jupiter is a great comet catcher. ...No one knows how old Saturn's rings are. ...Uranus is more stormy than we thought. ...Neptune has supersonic winds.