Approximately 115 tons of ocean salt spray enters the earth's atmosphere each second.
Any space vehicle must move at a rate of 7 miles per second in order to escape the earth's gravitational pull.
All of the Earth's continents are wider at the north than in the south, nobody knows why.
A 100-pound person on Earth would weigh 38 pounds on Mars.
41% of the moon is not visible from earth at any time.