Any space vehicle must move at a rate of 7 miles per second in order to escape the earth's gravitational pull.
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Some asteroids have other asteroids orbiting them.
131
Astronomer Percival Lowell believed that he was the first person to observe canals on Venus, but because of a faulty adjustment of the eyepiece on his telescope, he was in fact looking at the blood vessels in his own eye.
4
The last time that the Sun was in its current position in space around the Milky Way, dinosaurs ruled the Earth.
10
More than 20 million meteoroids enter Earth's atmosphere every day.
139
Lightning strikes about 6,000 times per minute on this planet!
158
An organisation called Mars One is planning to establish a permanent colony of humans on Mars by 2023.
9