The earth rotates more slowly on its axis in March than in September.
145
The density of Saturn is so low that if you were to put it in a giant glass of water it would float.
219
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
41% of the moon is not visible from earth at any time.
103
A 100-pound person on Earth would weigh 38 pounds on Mars.
102
Jupiter has radio storms so strong that they can be picked up and heard by an AM radio.
16