Space10 mysteries of the universe: Is our solar system normal?Puffball planets the density of polystyrene are just some of the oddities we’ve spied in other solar systems – is our own backyard the exception, not the rule?Features
SpaceFrankenstein planets may form from the wreckage of dead worlds When stars die, they can explode and destroy any planets nearby. But new worlds could arise out of the debris and some could reach the mass of 10 Earths ¿ìè¶ÌÊÓÆµ