Scientists have long assumed that, like rocky planets such as Earth, sub-Neptunes begin with molten magma oceans. Their thick ...

Nearly a century after Pluto’s discovery, astronomers are still hunting for mysterious planets beyond Neptune - including a ...

Scientists have discovered a rare six-planet system, HD 110067, where all planets orbit their star in perfect mathematical harmony.

In a landmark achievement, astronomers have identified a super-Earth exoplanet only 18 light-years away that meets all the ...

An enigmatic, cloud-enshrouded planet that has puzzled astronomers for years turns out to be less hot than expected – and surprisingly shiny. That's what the James Webb Space Telescope revealed when ...

Artist’s concept of a Neptune-sized planet, left, around a blue, A-type star. UC Berkeley astronomers have discovered a hard-to-find gas giant around one of these bright, but short-lived, stars, right ...

Find the answer for Planet between Saturn and Neptune from the people who brought you the USA TODAY Daily Crossword Puzzle.

Among the most famous images taken by the Voyager spacecraft are those of Uranus and Neptune. When you think of these planets, you’re likely imagining them based on the images taken by Voyager 2 in ...

New research by a University of Victoria PhD student is challenging popular theory about how part of our solar system formed. At the meeting of the American Astronomical Society’s Division of ...