41% of the moon is not visible from earth at any time.
103
Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
160
The Earth gets 100 tons heavier every day due to falling space dust.
673
Sound doesn't travel in space.
255
If two pieces of metal touch in space, they become permanently stuck together.
808
All of the Earth's continents are wider at the north than in the south - and nobody knows why.
194
An international team of astronomers has spotted the farthest known gravitational lens and, as Albert Einstein predicted, it is a galaxy that deflects and intensifies the light of a much further object.
9