The Earth weighs around 6,600,000,000,000,000,000,000 tons (5,940 billion billion metric tons)!
221
Pluto is smaller than Russia.
9
The heart of an astronaut actually gets smaller when in outer space.
216
41% of the moon is not visible from earth at any time.
103
An organisation called Mars One is planning to establish a permanent colony of humans on Mars by 2023.
9
It takes eight and a half minutes for light to get from the sun to earth.
159
Astronauts cannot burp in space.
232