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
The temperature of the earth's interior increases by 1 degree every 60 feet down.
115
Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
160
Today's top fuel dragsters take off with more force than the space shuttle.
120
The moon is actually moving away from Earth at a rate of 1.5 inches per year.
236
Tidal forces between the Earth and Moon are slowing the Earth down and pushing the Moon further away.
46
All of the Earth's continents are wider at the north than in the south - and nobody knows why.
194
In the last 7 years, humanity has discovered 43 potentially habitable planets.
14