Neil Armstrong, the first man to step foot on the moon, carried with him a piece of cloth and wood from the original 1903 Wright Flyer.
12
The Earth weighs around 6,600,000,000,000,000,000,000 tons (5,940 billion billion metric tons)!
221
All of the Earth's continents are wider at the north than in the south - and nobody knows why.
194
The Sun and Moon appear to be the same size because the moon is 400 times smaller than the Sun, but 400 times closer to Earth.
13
Saturn's moon, Mimas, not only looks like the Death Star, it also has a Pac Man heat signature.
15
More than 20 million meteoroids enter Earth's atmosphere every day.
139
Earth is the only planet in our solar system that's not named after a god or goddess.
17