Some asteroids have other asteroids orbiting them.
131
41% of the moon is not visible from earth at any time.
103
There are approximately 3,500 astronomers in the U.S. - but over 15,000 astrologers.
124
A 100-pound person on Earth would weigh 38 pounds on Mars.
102
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
Jupiter's moon Ganymede, is larger than the planet Mercury!
149
In space, astronauts cannot cry properly, because there is no gravity, so the tears can't flow down their faces!
175