Pluto was reclassified as a dwarf planet in 2006, but new discoveries and fresh debate are reigniting calls to restore its ...

A new 2024 study adds fresh weight to the idea that a large unseen planet could be lurking far beyond Neptune. By tracking ...

The head of NASA says maybe Pluto is a planet after all. He is wrong because Pluto is part of the rest of the solar system ...

Citizen scientists working with NASA have helped identify more than 3,000 brown dwarfs—dim, elusive objects that sit between ...

Astronomers have detected a thin atmosphere around a tiny celestial body in the outer solar system for the first time — an ...

A 2024 study has delivered the strongest statistical evidence yet for the existence of Planet 9, a hypothesized world far beyond Neptune whose gravity could explain unusual orbits of distant solar ...

Scientists suggest that a fifth, hidden force linked to dark energy may exist in the solar system but has not yet been ...

It's time to revisit the 9th planet.

On Tuesday, responding to a question during a testimony to a US Senate committee, NASA administrator Jared Isaacman said he ...

"Most planetary systems appear as 'peas in a pod.' This is not the case in the TOI-201 system." ...

Is Pluto a planet? At a U.S. Senate committee hearing this week, NASA's chief shared his thoughts on the decades-long debate.

A strange planetary system called TOI-201 is changing in real time, with three very different worlds pulling on each other.