Mars had an oxygen-rich atmosphere around 4 billion years ago
13
A 100-pound person on Earth would weigh 38 pounds on Mars.
102
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
If aliens located 60-65 million light years away from us, looked at earth through a really powerful telescope today, they would see dinosaurs!
18
In the last 7 years, humanity has discovered 43 potentially habitable planets.
14
The earth rotates more slowly on its axis in March than in September.
145
The last time that the Sun was in its current position in space around the Milky Way, dinosaurs ruled the Earth.
10