In the last 7 years, humanity has discovered 43 potentially habitable planets.
14
Summer on Uranus lasts for 21 years.
358
Pluto is smaller than Russia.
9
Any space vehicle must move at a rate of 7 miles per second in order to escape the earth's gravitational pull.
121
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
The population of the Earth has more than doubled since 1950.
151
The Space Shuttle main engine weighs 1/7th as much as a train engine but delivers as much horsepower as 39 locomotives.
147