Neil Armstrong, the first man to step foot on the moon, carried with him a piece of cloth and wood from the original 1903 Wright Flyer.
12
Summer on Uranus lasts for 21 years.
358
Tidal forces between the Earth and Moon are slowing the Earth down and pushing the Moon further away.
46
The Earth gets 100 tons heavier every day due to falling space dust.
673
Some asteroids have other asteroids orbiting them.
131
Sound doesn't travel in space.
255