Three hundred and twenty light years away in the Centaurus constellation sits one of the strangest planets humans have ever laid eyes on. It's four times as massive as Jupiter and orbits twice as far out as Pluto -- around one of its three suns.
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If you thought a comet that contains the building blocks of life and creates its own weather couldn't get any more interesting, think again. Scientists finally have a theory as to why comet 67P -- also known as Rosetta's comet -- has two distinct lobes. It's actually two distinct comets, which break up, orbit one another and smash together again and again for all of cometary eternity. And despite how strange this relationship sounds, it may be a lot more common than we thought.