Our solar system may have a ninth planet after all, following the declassification of Pluto nearly two decades ago, ...

The solar system also includes the Kuiper Belt and Oort Cloud, which are distant regions filled with small icy bodies and long-period comets. Related: 10 incredible volcanoes in our solar system ...

“Whether it is real or not, it is 100 percent NOT Planet Nine,” Brown says. “Planet Nine is a prediction based on inferred ...

Thanks to JWST, we've learned key details about methanol — a key building block for organic compounds necessary for life — on ...

Pluto, which infamously lost its status as the ninth planet in 2006, is less than four billion miles away from the sun, sitting in the Kuiper Belt - a region in our solar system beyond Neptune filled ...

A ninth planet the size of Neptune may be hidden in the far reaches of the solar system, but the evidence has left some experts skeptical.

Discovered in 1930, Pluto was long considered our Solar System's ninth planet, but was unseated in 2006 after the discovery ...

scientists think Vesta and the other three large objects in the belt are likely primordial and have survived for billions of ...

Astronomers may have found a candidate for Planet Nine. This planet is beyond Neptune. The finding could be the first ...