An organisation called Mars One is planning to establish a permanent colony of humans on Mars by 2023.
9
The temperature of the earth's interior increases by 1 degree every 60 feet down.
115
The Sun and Moon appear to be the same size because the moon is 400 times smaller than the Sun, but 400 times closer to Earth.
13
Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
160
Jupiter is bigger than all the other planets combined.
254
Jupiter's moon Ganymede, is larger than the planet Mercury!
149
Pluto is smaller than Russia.
9
The Space Shuttle main engine weighs 1/7th as much as a train engine but delivers as much horsepower as 39 locomotives.
147