A 100-pound person on Earth would weigh 38 pounds on Mars.
102
If you went out into space, you would explode before you suffocated because there's no air pressure.
149
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
Jupiter has radio storms so strong that they can be picked up and heard by an AM radio.
16
The Space Shuttle main engine weighs 1/7th as much as a train engine but delivers as much horsepower as 39 locomotives.
147
The Earth weighs around 6,600,000,000,000,000,000,000 tons (5,940 billion billion metric tons)!
221
In the last 7 years, humanity has discovered 43 potentially habitable planets.
14