A year on Mercury is 88 earth days, and a day is 15 hours. Mercury has no moons or rings.
Fun fact about Mercury is that its the closes to the sun.
Fun fact: More than 40 space crafts have explored Venus.
Fun fact: all water is frozen
Fun fact: The Juno mission will arrive at Jupiter in 2016.
Day:10 hours and a year:30 earth years. Saturn has 7 rings and 53 moons. Its the biggest planet.
Fun fact: first planet seen with a telescope.
Fun fact: Its the most dense planet.