There are more nerve cells in the human brain than there are stars in the Milky Way.
349
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
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
Jupiter is bigger than all the other planets combined.
254
Tidal forces between the Earth and Moon are slowing the Earth down and pushing the Moon further away.
46
It 'snows' metal on Venus.
13