Scientists may add a new dwarf planet to the official roster of our solar system. The distant, icy body, provisionally dubbed ...

A large icy world beyond Pluto could join the dwarf planet roster. Rubin observations and older images traced its orbit, but ...

The object, known for now as 2026 ED138, is one of the first discoveries by the new Vera C. Rubin Observatory in Chile.

But what exactly is a planet? It seems like an easy question. After all, you’re standing on one right now! But the scientific definition was fairly loose until recently. The discovery of other ...

Add Yahoo as a preferred source to see more of our stories on Google. Dottedhippo/Getty Images On August 24, 2006, our solar system lost a planet. It wasn't by cataclysmic destruction, but rather by ...

A new study suggests that our solar system’s smallest planet has shrunk by up to 30 percent since its birth roughly 4.5 billion years ago ...

Astronomers have uncovered evidence of a bizarre, potentially historic discovery: the first moon ever detected beyond our ...

See more of our trusted coverage when you search. Prefer Newsweek on Google to see more of our trusted coverage when you search. A leading scientist has told Newsweek about new evidence supporting the ...

The James Webb Space Telescope finds comet 3I/ATLAS's chemistry resembles that of some icy worlds beyond Neptune in our Solar ...

Some exoplanets absorb almost every ray of visible light that reaches them. Their darkness is revealing unexpected clues about the strange atmospheres surrounding distant worlds.

So far, humanity has yet to find its first "exomoon"—a moon orbiting a planet outside of the solar system. But that hasn't been for lack of trying. According to a new paper by Thomas Winterhalder of ...