Summer on Uranus lasts for 21 years.
358
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
NASA invented baby food as we know it today.
7
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
The density of Saturn is so low that if you were to put it in a giant glass of water it would float.
219
Pluto is smaller than Russia.
9