Mars had an oxygen-rich atmosphere around 4 billion years ago
13
The typical spec of dust that you see floating in the air is half way in size between the Earth and a subatomic particle.
131
41% of the moon is not visible from earth at any time.
103
The density of Saturn is so low that if you were to put it in a giant glass of water it would float.
219
It 'snows' metal on Venus.
13
The Earth gets heavier each day by tons, as meteoric dust settles on it.
118
Saturn's moon, Mimas, not only looks like the Death Star, it also has a Pac Man heat signature.
15