An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
In the last 7 years, humanity has discovered 43 potentially habitable planets.
14
A comet's tail always points away from the sun.
2
MDIF, a New York based non-profit organisation, is planning to beam free Wi-Fi to the entire world from space.
18
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
It 'snows' metal on Venus.
13