Bring up the former planet Pluto in conversation and you’re guaranteed to be met with a strong opinion. In one camp are those ...

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.

The newborn planetary system appears to be emerging 1,300 light-years away around a baby star known as HOPS-315. Planet-forming materials were first identified using NASA's James Webb Space Telescope.

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.

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

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

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