In space, astronauts cannot cry properly, because there is no gravity, so the tears can't flow down their faces!
175
There are two golf balls sitting on the moon.
721
One pinhead of the sun's energy is enough to kill a person at a distance of 160 kilometers.
277
Jupiter is bigger than all the other planets combined.
254
The Space Shuttle main engine weighs 1/7th as much as a train engine but delivers as much horsepower as 39 locomotives.
147
All of the Earth's continents are wider at the north than in the south - and nobody knows why.
194
Tidal forces between the Earth and Moon are slowing the Earth down and pushing the Moon further away.
46
The moon is actually moving away from Earth at a rate of 1.5 inches per year.
236