Mars had an oxygen-rich atmosphere around 4 billion years ago
13
Jupiter is bigger than all the other planets combined.
254
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
There are two golf balls sitting on the moon.
721
Sound doesn't travel in space.
255
If you went out into space, you would explode before you suffocated because there's no air pressure.
149
The earth travels through space at 660,000 miles per hour.
189
The earth rotates more slowly on its axis in March than in September.
145