In the last 7 years, humanity has discovered 43 potentially habitable planets.
14
The Space Shuttle main engine weighs 1/7th as much as a train engine but delivers as much horsepower as 39 locomotives.
147
In space, astronauts cannot cry properly, because there is no gravity, so the tears can't flow down their faces!
175
Jupiter's moon Ganymede, is larger than the planet Mercury!
149
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
Approximately 115 tons of ocean salt spray enters the earth's atmosphere each second.
100
It would take more than 150 years to drive a car to the sun.
569