In 2016, astronomers published a study suggesting a ninth planet could be hiding on the edge of our Solar System. Eight years later, they're still looking for it. So what will it take to find it?
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Beyond Neptune Scientists have long been hunting for a hidden planet out in the furthest reaches of our Solar System — and new research suggests with even more credibility that it's out there. In two new papers — one published in the Astronomical Journal, another, which has not yet been peer-reviewed, posted to the arXiv […]