An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
Earth is the only planet in our solar system that's not named after a god or goddess.
17
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
Only 55% of Americans know that the sun is a star.
986
Lightning strikes about 6,000 times per minute on this planet!
158
Astronauts get taller when they are in space.
224
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
All of the Earth's continents are wider at the north than in the south - and nobody knows why.
194