Is there a massive undiscovered planet on the outer reaches of the solar system? The idea has been around since before the ...

To understand the possibility of a new planet, we need to know where our current ones came from. About 4.6 billion years ago, our Solar System formed from a swirling cloud of gas and dust.

Espinoza is a leader in the new massive James Webb Space Telescope study of rocky worlds, specifically to find out if planets ...

Scientists have confirmed a potentially habitable fifth planet in the nearby L 98-59 system, revealing a diverse collection ...

Just the third-ever confirmed interstellar object has been detected in our solar system. Here's what we know. (Spoiler: It's not aliens.) ...

"It could represent some of the oldest and most pristine water ever observed, formed in another planetary system and ...

A mysterious interstellar object, 3I/ATLAS, discovered in July 2025, has sparked debate among astronomers. While most believe ...

A young sunlike star called HOPS 315 seems to host a swirling disk of gas giving rise to minerals that kick-start the planet formation process.

You can watch comet 3I/ATLAS live online tonight (July 3), thanks to the Virtual Telescope Project, which will livestream ...

Pluto was discovered in 1930 in Arizona, but in 2006 scientists decided to cut Pluto from the planetary line up. Here is why Pluto isn't a planet.

Scientists discover 3I/ATLAS, a possible 7-billion-year-old comet from deep space. It may rewrite what we know about the ...