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Discovery of ‘Goblin’ Solar System Object Bolsters the Case for Planet Nine

Astronomers have discovered an object, dubbed “the Goblin,” in the outer reaches of the Solar System. The dwarf planet never gets any closer to the Sun than 6 billion miles, but experts say its orbital configuration points to the existence of a much larger, more distant planet —the elusive Planet Nine. Read More >>

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Asteroid Discovery Boosts Evidence for Planet Nine

I’m sorry, but Pluto sucks and I’m glad it’s not a planet anymore. It’s smaller than our Moon, and it’s about the same size as several other distant, rocky objects. Have you ever seen the way it orbits alongside its partner, Charon? Classifying it as a planet in the first place was a mistake. Can we get a better ninth planet, please? Read More >>

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A Mysterious Mars-Sized Object Could Be Hiding at the Edge of Our Solar System

It’s been about 11 years since Pluto was demoted to dwarf planet status, leaving a 1,473 mile (2,370 kilometres)-size void in our hearts. Since then, the hunt for Planet X—aptly renamed Planet 9—has grown into an international movement to find such an object in the Kuiper Belt beyond Neptune’s orbit. Now, scientists Kat Volk and Renu Malhotra from the University of Arizona’s Lunar and Planetary Laboratory are upping the ante—they suggest that a completely different, tenth planetary-mass object is hiding somewhere in the Kuiper Belt as well. Is someone keeping track of all these goddamn hypothetical planets? Read More >>

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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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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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The Best Guess at What ‘Planet Nine’ Looks Like

The astronomical community is abuzz with the possibility that a ninth planet exists in the far reaches of the solar system. A new study by European scientists imagines what this hypothetical planet might look like, revealing important insights as to how we might actually find it. 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 >>