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

A new study, however, identifies a possible candidate. A separate team of astronomers compared 1983 data from the Infrared ...

While scientists are still trying to confirm Planet Nine's existence, NASA says proving that this ice giant is real would help astronomers explain several mysteries within our solar system.

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

1:54 Astronomers talk about evidence of 9th planet in our solar system Astronomer Mike Brown, who was first to propose the Planet 9 hypothesis in 2016 alongside colleague Konstantin Batygin ...

A team of international scientists has identified a promising Planet Nine candidate by comparing infrared surveys of the sky ...

A new look through decades-old data has unveiled some of the most compelling evidence yet of a hidden ninth planet in the far reaches of our solar system, far beyond ...

For nearly a decade, scientists have been on the hunt for Planet Nine – a hypothetical celestial object on the edge of our Solar System. Now, astronomers claim to have discovered this ninth ...

This week, an old astronomical controversy is renewed as researchers present new evidence for a hidden "Planet X" in our ...