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, somewhere beyond the orbit of Pluto, has so far evaded all our efforts to find it. We get it. It's very dark, very cold, and very far away, none of which is conducive to detection. And we have only a vague notion about where it might be. There's a lot of sky out there, and only one dark mote.
According to their recent study, the subtle abnormalities in the orbits of various objects some attribute to a hidden planet are also consistent with a different kind of gravitational model – one called Modified Newtonian Dynamics .were resolved by Einstein's theory of general relativity. MOND is an alternative solution that proposes other gravitational effects take over when Newtonian gravitational acceleration drops below a certain threshold.
Brown and Mathur thought that these clustering observations might not be compatible with MOND. They undertook an investigation, modeling the orbits of outer Solar SystemSurprisingly, what they ended up with was a bunch of rocks behaving pretty much exactly like the observed clustering. Their calculations suggest under MOND theory, some of the objects in the outer Solar System should be dragged into alignment with the gravitational field of the Milky Way galaxy over time.
It's not enough to confidently assert that MOND is responsible for the strange behavior of these distant rocks, rather than a planet. We just don't have enough data, either way. It does throw MOND into the mix of the things that could be out there instead of Planet Nine, though. Dynamical simulations would allow for a more detailed probe of the MOND hypothesis, and help cement it, or rule it out.
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