Utopia ia a large, smooth lying area of Mars.

In 5 billion years the Sun will run out of fuel and turn into a Red Giant.

The largest desert in the world, the Sahara, is 3,500,000 square miles.

Giraffes often sleep for only 20 minutes in any 24 hours. They may sleep up to 2 hours (in spurts - not all at once), but this is rare. They never lie down.

The speed of light is generally rounded down to 186,000 miles per second. In exact terms it is 299,792,458 m/s (metres per second – that is equal to 186,287.49 miles per second).

Each rubber molecule is made of 65,000 individual atoms.

Neutron stars are so dense that a teaspoonful would weigh more than all the people on Earth.

If the Sun were the size of a beach ball then Jupiter would be the size of a golf ball and the Earth would be as small as a pea.