The lurker in darkness...
, the team suggests that larger pieces of debris could've clumped together to form a planet-sized object billions of years ago that could've been sent hurtling out into the Oort cloud.
Alternatively, an exoplanet from another system could've gotten stuck in the solar system's Oort cloud, according to the researchers, the more likely outcome. "Dynamical instabilities among giant planets are thought to be nearly ubiquitous, and culminate in the ejection of one or more planets into interstellar space," the paper reads. "We find that a fraction of planets that would otherwise have been ejected are instead trapped on very wide orbits analogous to those of Oort cloud comets."But, as the scientists are the first to admit, neither theory is enormously likely: they estimate an 0.
It's a tantalizing theory that's bound to draw scrutiny. Could there be more planets lurking in the dark, mingling with icy comets? As , no mission has yet been sent to explore the Oort Cloud — though there's still a chance Voyager 1 and Voyager 2 may eventually pop in for a visit.
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