In space, astronauts cannot cry properly, because there is no gravity, so the tears can't flow down their faces!
174
The Earth gets heavier each day by tons, as meteoric dust settles on it.
117
Sound doesn't travel in space.
254
There are two golf balls sitting on the moon.
720
All of the Earth's continents are wider at the north than in the south - and nobody knows why.
193
One pinhead of the sun's energy is enough to kill a person at a distance of 160 kilometers.
276
Pluto is smaller than Russia.
8
41% of the moon is not visible from earth at any time.
102