The Space Shuttle main engine weighs 1/7th as much as a train engine but delivers as much horsepower as 39 locomotives.
147
Tidal forces between the Earth and Moon are slowing the Earth down and pushing the Moon further away.
46
There are 5 to 10 times more stars in the known Universe than there are grains of sand on all the world's beaches, but a single grain of sand has more atoms than there are stars in the known Universe.
20
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
Scientists have confirmed that Enceladus, one of Saturn’s moons, has a watery ocean.
6
Astronauts get taller when they are in space.
224
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
Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
160