Mars had an oxygen-rich atmosphere around 4 billion years ago
13
There are 5 to 10 times more stars in the known Universe than there are grains of sand on all the world's beaches, but a single grain of sand has more atoms than there are stars in the known Universe.
20
Only 55% of Americans know that the sun is a star.
986
The Earth gets 100 tons heavier every day due to falling space dust.
673
Any space vehicle must move at a rate of 7 miles per second in order to escape the earth's gravitational pull.
121
It 'snows' metal on Venus.
13
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
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