/ Modified sep 8, 2016 10:43 a.m.

Does 'Planet Nine' Exist? NAU Astronomer Says Maybe

Three objects discovered at edge of solar system may lead to planet's existence.

Planet Nine spotlight
Caltech/R. Hurt via NPR

By Melissa Sevigny, Arizona Science Desk

An astronomer at Northern Arizona University this week announced the discovery of three new objects at the far edge of the solar system, helping narrow the search for the hypothetical "Planet Nine."

The objects were found by NAU astronomer Chad Trujillo and his colleagues. They run the world’s largest survey for “extreme objects” that orbit the sun beyond the Kuiper Belt.

"We've been looking for all kinds of things on the outer edge, but it’s only been in the last year or two where we’ve really started to notice that some of these extreme objects seem to be pointing to the possibility of something big out there," Trujillo said.

Planet Nine is thought to be a massive ice giant lurking beyond Neptune. Trujillo and colleague Scott Sheppard proposed its existence in 2014. Earlier this year, two Caltech astronomers strengthened the case for Planet Nine based on the strange orbits of a cluster of space rocks.

Two of the new objects also have odd orbital alignments. That implies they’re influenced by the undiscovered planet. Trujillo said finding more objects like these will speed up the search.

By posting comments, you agree to our
AZPM encourages comments, but comments that contain profanity, unrelated information, threats, libel, defamatory statements, obscenities, pornography or that violate the law are not allowed. Comments that promote commercial products or services are not allowed. Comments in violation of this policy will be removed. Continued posting of comments that violate this policy will result in the commenter being banned from the site.

By submitting your comments, you hereby give AZPM the right to post your comments and potentially use them in any other form of media operated by this institution.
AZPM is a service of the University of Arizona and our broadcast stations are licensed to the Arizona Board of Regents who hold the trademarks for Arizona Public Media and AZPM. We respectfully acknowledge the University of Arizona is on the land and territories of Indigenous peoples.
The University of Arizona