Pluto is smaller than Russia.
9
Some asteroids have other asteroids orbiting them.
131
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
In space, astronauts cannot cry properly, because there is no gravity, so the tears can't flow down their faces!
175
The Earth weighs around 6,600,000,000,000,000,000,000 tons (5,940 billion billion metric tons)!
221