If two pieces of metal touch in space, they become permanently stuck together.
808
Pluto is smaller than Russia.
9
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
In 1859, the largest known geomagnetic storm struck the Caribbean, causing an aurora and telegraphs could even operate without a power source.
25
In the last 7 years, humanity has discovered 43 potentially habitable planets.
14
A comet's tail always points away from the sun.
2