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
On Titan, Saturn's largest moon, the atmosphere is so thick and the gravity so low that humans could fly through it by flapping "wings" attached to their arms.
7
An organisation called Mars One is planning to establish a permanent colony of humans on Mars by 2023.
9
Jupiter has radio storms so strong that they can be picked up and heard by an AM radio.
16
Astronauts get taller when they are in space.
224
The typical spec of dust that you see floating in the air is half way in size between the Earth and a subatomic particle.
131
The earth is .02 degrees hotter during a full moon.
157
The temperature of the earth's interior increases by 1 degree every 60 feet down.
115