"The planet is so light that it's difficult to think of an analogous, solid-state material," said Julien de Wit, MIT professor and study co-author, in a statement. "The reason why it's close to ...

Astronomers have catalogued more than five thousand planets orbiting distant stars, and a handful of them defy almost ...

A world located 1,200 light-years or so away from Earth is one of the least dense planets ever discovered—and its unusual properties have astronomers puzzled. It is 50% larger than Jupiter and as ...