The official number of exoplanets—planets outside our solar system—tracked by NASA has reached 6,000. Confirmed planets are ...

The solar system lost its ninth planet back when Pluto was demoted to a dwarf planet, but research might indicate that there ...

The coldest planet in the Solar System is Uranus, which is surprisingly colder than Neptune due to its unique internal heat ...

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Astronomers have directly spotted a rare young planet, WISPIT 2b, still forming within the gap of a dusty ringed disk around a star like our sun—something long theorized but never observed until now.

Astronomers have picked up evidence of an Earth-sized world, distinct from the previously hypothesised Planet Nine and Planet ...

Astronomers have been searching for evidence that Planet Nine exists for years Tobias Roetsch/Future Publishing via Getty Researchers have found more evidence that there is an unknown planet in our ...

A rocky, Earth-size planet located in our Milky Way galaxy may have an atmosphere around it, according to new research, ...

A research team led by geophysicists at UC San Diego's Scripps Institution of Oceanography provides an explanation for ...

Earth will move between Saturn and the sun this weekend, offering prime views of Saturn in what's known as "opposition." Here's what to know.