If two pieces of metal touch in space, they become permanently stuck together.
808
An international team of astronomers has spotted the farthest known gravitational lens and, as Albert Einstein predicted, it is a galaxy that deflects and intensifies the light of a much further object.
9
If NASA sent birds into space they would soon die; they need gravity to swallow.
146
One pinhead of the sun's energy is enough to kill a person at a distance of 160 kilometers.
277
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
A comet's tail always points away from the sun.
2
Tidal forces between the Earth and Moon are slowing the Earth down and pushing the Moon further away.
46
Neil Armstrong, the first man to step foot on the moon, carried with him a piece of cloth and wood from the original 1903 Wright Flyer.
12