Summer on Uranus lasts for 21 years.
358
If NASA sent birds into space they would soon die; they need gravity to swallow.
146
The light hitting the earth right now is 30 thousand years old.
163
Saturn's moon, Mimas, not only looks like the Death Star, it also has a Pac Man heat signature.
15
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
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