The Earth gets 100 tons heavier every day due to falling space dust.
673
Sound doesn't travel in space.
255
Jupiter is bigger than all the other planets combined.
254
Summer on Uranus lasts for 21 years.
358
A comet's tail always points away from the sun.
2
The Space Shuttle main engine weighs 1/7th as much as a train engine but delivers as much horsepower as 39 locomotives.
147
Pluto is smaller than Russia.
9