Mars had an oxygen-rich atmosphere around 4 billion years ago
13
There are more nerve cells in the human brain than there are stars in the Milky Way.
349
It 'snows' metal on Venus.
13
If you were to cry in space, the tears would form a bubble in your eye until it's so big it moves to another spot on your face.
10
There is a mysterious and loud radio signal known as 'the space roar' that has yet to be explained.
15
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