If Planet 9 is real, this observatory has around a 70 to 80 percent chance of finding it, he estimates, adding that it's not a sure thing because there are so many uncertainties.

New Horizons spacecraft survives trip 1 billion miles beyond Pluto 02:03. It's an evocative idea that has long bedeviled scientists: a huge and mysterious planet is lurking in the darkness at the ...

A possible new dwarf planet has been discovered at the edge of our solar system, so far-flung that it takes around 25,000 years to complete one orbit around the sun. The object, known as 2017 ...

It's an evocative idea that has long bedeviled scientists: a huge and mysterious planet is lurking in the darkness at the edge of our solar system, evading all our efforts to spot it.

A sizable world has been found in a part of the solar system that astronomers once thought to be empty. It probably qualifies as a dwarf planet, the same classification as Pluto.. Temporarily ...

The hunt for Planet Nine—the solar system’s ghostly gravitational troll—is longstanding, and is based on the peculiar clustering of rocky bodies in the Kuiper Belt beyond the orbit of Neptune.

Scientists find "strongest evidence yet" of life in space 01:04. Astronomers announced Thursday that they had detected the most promising "hints" of potential life on a planet beyond our solar ...

Scientists at the Institute for Advanced Study in Princeton, New Jersey, discover a new trans-Neptune Object, 2017OF201, potentially discrediting 2016 theory of Planet Nine.

Researchers at Cambridge University's Institute of Astronomy believe that there is a 99.7% chance of life on K2-18b, a large planet located 700 trillion miles from Earth ...