Mars had an oxygen-rich atmosphere around 4 billion years ago
13
The earth rotates more slowly on its axis in March than in September.
145
Jupiter has radio storms so strong that they can be picked up and heard by an AM radio.
16
41% of the moon is not visible from earth at any time.
103
There's a mysterious dwarf planet between Mars and Jupiter called 'Ceres' which has never been visited by spacecraft or photographed in detail, however, Earth-bound telescopes reveal a large bright shining spot on the surface of this planet, the origin and nature of which are unknown.
5
The heart of an astronaut actually gets smaller when in outer space.
216
Tidal forces between the Earth and Moon are slowing the Earth down and pushing the Moon further away.
46
Saturn's moon, Mimas, not only looks like the Death Star, it also has a Pac Man heat signature.
15