The heart of an astronaut actually gets smaller when in outer space.
216
Jupiter has radio storms so strong that they can be picked up and heard by an AM radio.
16
Pluto is smaller than Russia.
9
41% of the moon is not visible from earth at any time.
103
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
Scientists have confirmed that Enceladus, one of Saturn’s moons, has a watery ocean.
6
If you went out into space, you would explode before you suffocated because there's no air pressure.
149
The Earth weighs around 6,600,000,000,000,000,000,000 tons (5,940 billion billion metric tons)!
221