As published in The Astrophysical Journal Letters, theoretical astrophysicists Konstantin Batygin and Jim Fuller of Caltech, ...

Explore every planet in our Solar System through a simulation that shows the views each world might reveal from its surface ...

You start your day hearing wild news. Jupiter has just swallowed Saturn. And it doesn’t stop there. Jupiter is on its way to ...

Our definition of a planet has changed over the years — causing a bit of confusion. | Credit: wasan prunglampoo/Getty Images Over the past 250 years, the number of "planets" in our solar system has ...

In the early history of our solar system, scientists theorize that a Mars-sized object called Theia smashed into the infant Earth, vaporizing massive amounts of rock and blasting it into space. Some ...

The James Webb Space Telescope is helping astronomers study planetary collisions in other star systems like the type ...

Pluto is now the most well known of the outer worlds beyond Neptune—and the darling of the solar system Kayla Randall | Digital Editor, Museums A 24-year-old observatory assistant from the Midwest ...

Mercury, the solar system’s smallest planet and the one closest to the sun, hasn’t received as much love as its celestial neighbors. It’s the least explored of the inner solar system planets, which ...

Around the bright star Fomalhaut, astronomers spotted glowing clouds of debris left behind by colossal collisions between large space rocks. One of these clouds was even mistaken for a planet before ...

Learn how Pluto nearly kept its planet status in a proposed 12-planet Solar System as its demotion marks its 20th anniversary. Eight days before Pluto lost its planetary status, it appeared ready to ...