Mars had an oxygen-rich atmosphere around 4 billion years ago
13
There is a mysterious and loud radio signal known as 'the space roar' that has yet to be explained.
15
Venus is the only planet that rotates clockwise.
310
A comet's tail always points away from the sun.
2
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
In space, astronauts cannot cry properly, because there is no gravity, so the tears can't flow down their faces!
175
Any space vehicle must move at a rate of 7 miles per second in order to escape the earth's gravitational pull.
121