Mars had an oxygen-rich atmosphere around 4 billion years ago
13
Sound doesn't travel in space.
255
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
The ashes of the man who discovered Pluto are currently en route to dwarf planet, scheduled to arrive on the 14th of July, 2015.
11
Lightning strikes about 6,000 times per minute on this planet!
158
It would take more than 150 years to drive a car to the sun.
569
The light hitting the earth right now is 30 thousand years old.
163