A huge galaxy orbiting our own Milky Way has seemingly appeared out of nowhere. The newly spotted dwarf galaxy, which has been named Crater 2, sits around 400,000 light-years away, and has already earned the title of the fourth largest known galaxy circling our own.
So how does a galaxy that big stay hidden for so long? Crater 2 has always been there, quietly circling our own giant galaxy. But its stars are so diffuse that it’s incredibly dark, and it’s been masked up until now by its brighter neighbours.