Astronomers have worked out that around 15 percent of stars host solar systems like our own, with several gas giant planets in the outer regions.
NASA's Solar and Helioscopic Observatory (SOHO) has captured footage of a comet being swallowed by the sun.
New satellite images suggest that Mars was warm enough to sustain lakes as recently as three billion years ago.
NASA's Kepler space telescope has discovered five planets located outside of our solar system.
But rules out nuclear strike
Osiris-Rex, SAGE or MoonRise
They'll know it when they see it
?An "unsettling" combination of strangeness
Methane couldn't be coming from meteorites
600 million years after the Big Bang?
Test flights to start next year
Forming 350 stars per year
Meteorite contains fossil bacteria
And they don't like us wearing lipstick