Tidal forces between the Earth and Moon are slowing the Earth down and pushing the Moon further away.
46
All of the Earth's continents are wider at the north than in the south - and nobody knows why.
194
The Earth weighs around 6,600,000,000,000,000,000,000 tons (5,940 billion billion metric tons)!
221
An organisation called Mars One is planning to establish a permanent colony of humans on Mars by 2023.
9
There are 5 to 10 times more stars in the known Universe than there are grains of sand on all the world's beaches, but a single grain of sand has more atoms than there are stars in the known Universe.
20
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
Mars had an oxygen-rich atmosphere around 4 billion years ago
13