Summer on Uranus lasts for 21 years.
358
Sound doesn't travel in space.
255
Jupiter's magnetosphere is the largest single structure inside the Solar System. If you could see it with your eyes, it would appear larger than our full Moon.
8
The earth travels through space at 660,000 miles per hour.
189
An organisation called Mars One is planning to establish a permanent colony of humans on Mars by 2023.
9
A comet's tail always points away from the sun.
2
The population of the Earth has more than doubled since 1950.
151
A 100-pound person on Earth would weigh 38 pounds on Mars.
102