The typical spec of dust that you see floating in the air is half way in size between the Earth and a subatomic particle.
131
Tidal forces between the Earth and Moon are slowing the Earth down and pushing the Moon further away.
46
In space, astronauts cannot cry properly, because there is no gravity, so the tears can't flow down their faces!
175
A 100-pound person on Earth would weigh 38 pounds on Mars.
102
If two pieces of metal touch in space, they become permanently stuck together.
808
Only 55% of Americans know that the sun is a star.
986
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
The Earth weighs around 6,600,000,000,000,000,000,000 tons (5,940 billion billion metric tons)!
221