The Earth gets 100 tons heavier every day due to falling space dust.
673
The heart of an astronaut actually gets smaller when in outer space.
216
A 100-pound person on Earth would weigh 38 pounds on Mars.
102
Summer on Uranus lasts for 21 years.
358
41% of the moon is not visible from earth at any time.
103
In space, astronauts cannot cry properly, because there is no gravity, so the tears can't flow down their faces!
175
A car traveling 100 mph would take more than 29 million years to reach the nearest star (to our solar system)
88
The light hitting the earth right now is 30 thousand years old.
163