Mars had an oxygen-rich atmosphere around 4 billion years ago
13
Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
160
One pinhead of the sun's energy is enough to kill a person at a distance of 160 kilometers.
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Some asteroids have other asteroids orbiting them.
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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
The last time that the Sun was in its current position in space around the Milky Way, dinosaurs ruled the Earth.
10
There are two golf balls sitting on the moon.
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