Astronomers using the James Webb Space Telescope have directly detected the faint glow of a planet that’s colder than any world whose light has been directly observed—an astonishing detection that ...

Astronomers find evidence of a possible ninth planet beyond Neptune, reigniting the debate about the formation of the Solar ...

So, not including regular "empty" space, what is the coldest place in the solar system? And how does it compare with temperatures on Earth? However, taking cosmic measurements isn't always simple.

Our solar system may have a ninth planet after all ... MORE: Exoplanet discovered in 2020 has the coldest temperatures ever measured, scientists say The hidden candidate is likely the size ...

Astronomers have found new evidence that a mysterious ninth planet may be hiding at the edge of the solar system - rewriting what we know about the cosmos again. An international team from Taiwan ...

All of our solar system’s planets are lining up in the ... which is most the distant planet, takes nearly 165 Earth years. A great alignment is possible only when the planets are all relatively ...

Mike Brown is convinced that beyond Neptune, at the far reaches of our solar system, there's an unseen giant planet. "This is the 5th largest planet in our solar system, lurking out there ...