The last time that the Sun was in its current position in space around the Milky Way, dinosaurs ruled the Earth.
10
Today's top fuel dragsters take off with more force than the space shuttle.
120
Tidal forces between the Earth and Moon are slowing the Earth down and pushing the Moon further away.
46
On Titan, Saturn's largest moon, the atmosphere is so thick and the gravity so low that humans could fly through it by flapping "wings" attached to their arms.
7
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
More than 20 million meteoroids enter Earth's atmosphere every day.
139
Summer on Uranus lasts for 21 years.
358
Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
160