Earth is the only planet in our solar system that's not named after a god or goddess.
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On Titan, Saturn's largest moon, the atmosphere is so thick and the gravity so low that humans could fly through it by flapping "wings" attached to their arms.
7
If NASA sent birds into space they would soon die; they need gravity to swallow.
146
Summer on Uranus lasts for 21 years.
358
It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
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There is a mysterious and loud radio signal known as 'the space roar' that has yet to be explained.
15
A comet's tail always points away from the sun.
2