41% of the moon is not visible from earth at any time.
103
Jupiter's moon Ganymede, is larger than the planet Mercury!
149
Scientists have confirmed that Enceladus, one of Saturn’s moons, has a watery ocean.
6
Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
160
Sound doesn't travel in space.
255
Summer on Uranus lasts for 21 years.
358
The heart of an astronaut actually gets smaller when in outer space.
216
The moon is actually moving away from Earth at a rate of 1.5 inches per year.
236