There is a mysterious and loud radio signal known as 'the space roar' that has yet to be explained.
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The heart of an astronaut actually gets smaller when in outer space.
216
The Earth weighs around 6,600,000,000,000,000,000,000 tons (5,940 billion billion metric tons)!
221
Jupiter has radio storms so strong that they can be picked up and heard by an AM radio.
16
Saturn's moon, Mimas, not only looks like the Death Star, it also has a Pac Man heat signature.
15
Lightning strikes about 6,000 times per minute on this planet!
158
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.
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