In space, astronauts cannot cry properly, because there is no gravity, so the tears can't flow down their faces!
175
The Space Shuttle main engine weighs 1/7th as much as a train engine but delivers as much horsepower as 39 locomotives.
147
A 100-pound person on Earth would weigh 38 pounds on Mars.
102
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
Approximately 115 tons of ocean salt spray enters the earth's atmosphere each second.
100
The volume of the Earth's moon is the same as the volume of the Pacific Ocean.
178