There are 5 to 10 times more stars in the known Universe than there are grains of sand on all the world's beaches, but a single grain of sand has more atoms than there are stars in the known Universe.
20
Summer on Uranus lasts for 21 years.
358
Saturn's moon, Mimas, not only looks like the Death Star, it also has a Pac Man heat signature.
15
Jupiter is bigger than all the other planets combined.
254
The Space Shuttle main engine weighs 1/7th as much as a train engine but delivers as much horsepower as 39 locomotives.
147
A comet's tail always points away from the sun.
2
It 'snows' metal on Venus.
13