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

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Our solar system ...

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

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

The Kuiper Belt is loosely defined as a doughnut-shaped swath of space beginning just beyond the orbit of Neptune and ...

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

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

This landmark discovery of the planet – named TWA 7b – which was recently published in the journal Nature, came after an ...

Astronomers have been scouring the outer solar system for signs of a hypothetical ninth planet for almost a decade, without success. However, we may finally be on the cusp of finding it, experts say.