A 100-pound person on Earth would weigh 38 pounds on Mars.
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Mars had an oxygen-rich atmosphere around 4 billion years ago
13
Jupiter is bigger than all the other planets combined.
254
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
Lightning strikes about 6,000 times per minute on this planet!
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Jupiter has radio storms so strong that they can be picked up and heard by an AM radio.
16
Earth is the only planet in our solar system that's not named after a god or goddess.
17
There are 5 to 10 times more stars in the known Universe than there are grains of sand on all the world's beaches, but a single grain of sand has more atoms than there are stars in the known Universe.
20