The Earth gets 100 tons heavier every day due to falling space dust.
673
Sound doesn't travel in space.
255
Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
160
Jupiter's magnetosphere is the largest single structure inside the Solar System. If you could see it with your eyes, it would appear larger than our full Moon.
8
The heart of an astronaut actually gets smaller when in outer space.
216
Pluto is smaller than Russia.
9