Astronomers have made a groundbreaking discovery that could lead to the identification of the elusive Planet 9! This giant, mysterious world, potentially larger than Neptune, was detected in two ...

Mike Brown is convinced that beyond Neptune, at the far reaches of our solar system, there's an unseen giant planet. "This is the 5th largest planet in our solar system, lurking out there, waiting to ...

When you buy through links on our articles, Future and its syndication partners may earn a commission. Planet Nine is a hypothesized massive planet, first proposed in 2014, that is speculated to orbit ...

Astronomers have discovered icy rocks in the outer solar system that seem to defy the laws of physics, suggesting the ...