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
It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
6
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
Jupiter is bigger than all the other planets combined.
254
The density of Saturn is so low that if you were to put it in a giant glass of water it would float.
219
A comet's tail always points away from the sun.
2
If NASA sent birds into space they would soon die; they need gravity to swallow.
146
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