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Planet Nine Just Got An Unexpected New Team of Hunters

Since Pluto was infamously demoted to a dwarf planet in 2006, some astronomers have turned their attention to finding the true Planet 9, a hypothetical, Neptune-sized world that orbits the Sun at least a few hundred times further out than Earth. While there’s no shortage of ideas about what Planet 9 could look like—or what it may have experienced throughout its life—so far, no one has been able to spot this elusive world. Read More >>

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Our Sun May Have Snatched Planet 9 From Outside the Solar System

Those with a Pluto-the-planet-shaped void in their hearts have been eagerly following updates about Planet 9, a hypothetical world thought to be 10 times more massive than Earth and roughly 1,000 astronomical units (AU) away from the Sun. While there are naysayers aplenty, new research validates believers — and delivers some unexpected news about the planet’s rough childhood. Read More >>

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Our Sun’s Quirky Tilt Means Planet Nine Might Actually Exist

New research links the odd and unexplained six-degree tilt of our Sun to an undiscovered planet in the outer reaches of our solar system. It’s even more evidence that planet Nine is for real. Read More >>

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Planet Nine Just Got Weirder

If Planet Nine exists, it’s been through one hell of an ordeal. That’s the conclusion to draw from a series of new studies that ask how in the name of Uranus a planet could have gotten itself into such a strange orbit. This in turn might help explain the unlikely orbits of half a dozen Kuiper Belt objects. Read More >>

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How Astronomers Are Going to Find Planet Nine

Ten years ago, billions of humans had their worldview upended when a group of astronomers announced that the solar system only contains eight planets. Now, the same guys are trying to rewrite our childhood mnemonics once again. A ninth planet may exist after all, and it isn’t Pluto. Read More >>

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The Amazing Way Astronomers Are Now Hunting For Planet Nine

Saturn’s Cassini probe is nearing the end of its mission, but that doesn’t mean it’s no longer useful. In fact, astronomers have found a totally new purpose for the plucky little space probe: searching for the elusive Planet 9. Read More >>