41% of the moon is not visible from earth at any time.
103
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
Astronauts cannot burp in space.
232
Today's top fuel dragsters take off with more force than the space shuttle.
120
Any space vehicle must move at a rate of 7 miles per second in order to escape the earth's gravitational pull.
121
It takes eight and a half minutes for light to get from the sun to earth.
159
A comet's tail always points away from the sun.
2
In space, astronauts cannot cry properly, because there is no gravity, so the tears can't flow down their faces!
175