open image in gallery Is there a possible ninth planet in our solar system? Researchers say they may have found a candidate (Credit: ESO/Tom Ruen/nagualdesign) But, the announcement has been met ...

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

If the object really is Planet Nine, it would be larger than Neptune and exist 700 times further from the sun than Earth.

an expanse of icy debris surrounding the solar system. Hints of this object, dubbed by the researchers as Planet Nine, were found in two photos taken by two infrared space telescopes in 1983 and ...

The hunt for Planet Nine—the solar system’s ghostly gravitational troll ... estimating Planet Nine to be just over six times Earth’s mass, with an orbit of 7,400 years—close enough ...

there is solid evidence that the solar system's planetary census is incomplete." Article continues below No observational evidence for Planet Nine has been found, but the latest study is not the ...

But there may yet be another world lurking beyond Neptune — and astronomers may have just found it. In 2016, astronomers proposed that our solar system could harbor a stealthy ninth planet based ...

The ongoing search for an additional planet at the solar system's edge has identified a new candidate, potentially challenging previous predictions. A research team from Taiwan, Japan and ...

"For the first time in over 150 years, there is solid evidence that the solar system's planetary census is incomplete." No observational evidence for Planet Nine has been found, although this is ...

There have been questions about a mysterious ninth planet in our solar system for nearly a decade. Pluto was unseated as number nine in 2006. Now, a group of international researchers say they may ...