A comet's tail always points away from the sun.
2
Pluto is smaller than Russia.
9
Sound doesn't travel in space.
255
All of the Earth's continents are wider at the north than in the south - and nobody knows why.
194
The Earth weighs around 6,600,000,000,000,000,000,000 tons (5,940 billion billion metric tons)!
221
The earth rotates more slowly on its axis in March than in September.
145
Astronauts cannot burp in space.
232