There are more nerve cells in the human brain than there are stars in the Milky Way.
349
Sound doesn't travel in space.
255
Pluto is smaller than Russia.
9
The Space Shuttle main engine weighs 1/7th as much as a train engine but delivers as much horsepower as 39 locomotives.
147
It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
6
Tidal forces between the Earth and Moon are slowing the Earth down and pushing the Moon further away.
46
It would take more than 150 years to drive a car to the sun.
569