In space, astronauts cannot cry properly, because there is no gravity, so the tears can't flow down their faces!
175
It 'snows' metal on Venus.
13
Any space vehicle must move at a rate of 7 miles per second in order to escape the earth's gravitational pull.
121
The temperature of the earth's interior increases by 1 degree every 60 feet down.
115
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
Approximately 115 tons of ocean salt spray enters the earth's atmosphere each second.
100
Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
160