In the last 7 years, humanity has discovered 43 potentially habitable planets.
14
Jupiter's moon Ganymede, is larger than the planet Mercury!
149
If you went out into space, you would explode before you suffocated because there's no air pressure.
149
A comet's tail always points away from the sun.
2
41% of the moon is not visible from earth at any time.
103
The Space Shuttle main engine weighs 1/7th as much as a train engine but delivers as much horsepower as 39 locomotives.
147
The earth travels through space at 660,000 miles per hour.
189
