trans-neptunian objects

Scientists have long been hunting for a hidden planet in our Solar System — and new research suggests that it's out there. 

Ninth Rock

There may be a ninth planet after all.

Scientists Say They've Found More Evidence of Hidden Planet in Our Solar System

Planetary scientists suggest an Earth-like planet, no bigger than three times the Earth's mass, could lurk beyond the orbit of Neptune.

Planet 8.5

Have we finally cracked the code?

Scientists Say There May Be Another Earth-Sized Planet Lurking in the Solar System

A team of astronomers suggest trans-Neptunian objects could still be distributed uniformly in our Solar System, poking a hole in the Planet Nine theory.

Captain Planet

Did the scientists behind the Planet Nine hypothesis make an embarrassing mistake?

Planet Nine Might Not Actually Exist, Scientists Say

A team of astronomers at the UPenn have discovered 139 minor planets — too small for a planet, but not a comet either — orbiting the Sun past Neptune.

trans-neptunian objects

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