There are two golf balls sitting on the moon.
721
The Earth gets heavier each day by tons, as meteoric dust settles on it.
118
41% of the moon is not visible from earth at any time.
103
The Space Shuttle main engine weighs 1/7th as much as a train engine but delivers as much horsepower as 39 locomotives.
147
Any space vehicle must move at a rate of 7 miles per second in order to escape the earth's gravitational pull.
121
If you went out into space, you would explode before you suffocated because there's no air pressure.
149
The population of the Earth has more than doubled since 1950.
151
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