The featherweight pair — orbiting a star 1,110 light-years away — are the biggest exoplanets found to have less density than ...

A pair of sibling gas giants originally spotted by citizen scientists are so lightweight that their density resembles wispy cotton candy more than a standard atmosphere. The rare duo detailed today in ...

They’re less dense than cotton candy, and they will help astrophysicists better understand the most unusual ways giant planets can form.

A new investigation into old Kepler data has revealed that a planetary system once thought to house zero planets actually has two planets that orbit their star in a unique style, like an old-fashioned ...

Astronomers have uncovered evidence of a spectacular collision of two planets within the confines of a faraway solar system, providing us with a rare chance to observe firsthand the extremes of ...

Add Yahoo as a preferred source to see more of our stories on Google. And yes, there is a difference between the two celestial sights. "Planetary alignment is an astronomical term used to describe the ...

We usually think of our Solar System as a calm, well-organized family of planets, but a new study suggests its early days may have been far more chaotic. Instead of the four giant planets we know ...

Astronomers call it KOI-134, and it's a star located 3,747 light-years away from Earth. Despite the huge distance that separates us, we've known it was there for more than a decade now, ever since the ...

WASHINGTON, April 18 (Reuters) - In a memorable image from the 1977 film "Star Wars," the young hero Luke Skywalker gazes at two suns setting above the horizon on his desert planet Tatooine.