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

Astronomers have uncovered a massive new trans-Neptunian object, 2017 OF201, lurking at the edge of our solar system. With an ...

A new trans-Neptunian object, 2017 OF201, has been found with a vast orbit and potential dwarf planet size. The finding hints ...

New discoveries of objects in the Kuiper Belt have also presented challenges for the Planet Nine theory. The latest is known ...

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

To unravel the mystery of Jupiter's birth, scientists turned their attention to meteorites. These cosmic 'messengers' carry a ...

An astronomer at the University of Arizona is excited about the potential for life on a possible planet in the nearest solar ...

Recent research suggests a warp in the orbital plane of Trans-Neptunian Objects (TNOs) between 80 and 400 AU, hinting at the ...

A Jupiter-like planet has been found orbiting a young sun-like star in a solar system far away in what is a potentially ...

Where is our solar system’s super-Earth? The planets astronomers see often around other stars are strangely absent from our own solar system. We’re still figuring out why.

Since the first discovery of planets beyond the solar system in 1995, more than 6,000 exoplanets have been identified. Many ...

A ninth large planet may lurk deep in the outer solar system. The planet, illustrated here, is far from the sun and thought to be gaseous like Uranus and Neptune, though smaller than both ice giants.