Mars had an oxygen-rich atmosphere around 4 billion years ago
13
The heart of an astronaut actually gets smaller when in outer space.
216
The last time that the Sun was in its current position in space around the Milky Way, dinosaurs ruled the Earth.
10
The volume of the Earth's moon is the same as the volume of the Pacific Ocean.
178
A comet's tail always points away from the sun.
2
A 100-pound person on Earth would weigh 38 pounds on Mars.
102
It 'snows' metal on Venus.
13
The center of the galaxy tastes like raspberries and smells like rum, according to astronomers.
4