Mars had an oxygen-rich atmosphere around 4 billion years ago
13
The light hitting the earth right now is 30 thousand years old.
163
A neutron star (what remains after a Super Nova) is so dense that a portion of it the size of a sugar cube would weigh as much as all of humanity, or more than all the cars in the United States.
5
Some asteroids have other asteroids orbiting them.
131
It 'snows' metal on Venus.
13
It would take more than 150 years to drive a car to the sun.
569
There is a mysterious and loud radio signal known as 'the space roar' that has yet to be explained.
15