A newly studied solar system breaks the usual planet pattern, raising fresh questions about how rocky and gas planets form.

Add Yahoo as a preferred source to see more of our stories on Google. Six of the planets of the Solar System are about to line up for a rare sight in Earth's sky. It's not uncommon for several planets ...

It is a question that feels like it should have a straightforward answer: how many planets are there in our solar system? Since Pluto was relegated back down to dwarf planet status, almost everyone ...

NASA’s Kepler mission has verified 1,284 new planets – the single largest finding of planets to date. “This announcement more than doubles the number of confirmed planets from Kepler,” said Ellen ...

We can expect some stunning celestial events in 2025, including the Jan. 13 Wolf Moon and a remarkable planetary parade, where seven planets will align in the night sky, that starts tonight. A parade ...

Astronomers have found thousands of exoplanets around single stars, but few around binary stars—even though both types of stars are equally common. Physicists can now explain the dearth.