A pair of giant planets circling a star more than 1,100 light-years from Earth looks almost too bloated to be real. Each world is about the size of Jupiter. Yet both are far lighter than expected, ...

Backyard astronomers won't want to miss this special phenomena that will occur next week.

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 ...

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 ...

Add Yahoo as a preferred source to see more of our stories on Google. A pair of sibling gas giants originally spotted by citizen scientists are so lightweight that their density resembles wispy cotton ...