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Hmm, but if we’re suspended in a homogeneous “soup” of Dark Matter, the surely such forces would cancel out?

Do we except Dark Matter to be distributed inhomogeneously around the Solar System? I thought it is only in homogenous at ~galactic scales.

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Warning, I am also a layman, but I don't think we know how clumped dark matter is. We know it has to be spread out on galactic scales, but that doesn't mean it's spread out at solar system scales. Some people even suggest dark matter could be black holes with intermediate masses. If we can figure out how concentrated or spread out dark matter is at the solar system level, it constrains the models that would fit the new data.

https://xkcd.com/2186/

Earths dark matter is equivalent to one squirrel.

Right, but even that link suggests dark matter is pretty homogeneous around Solar System, right? If it’s simply described as a density number.

Is the suggested experiment just measuring that homogeneous density? Or hoping to find some distribution around the Solae System?

We've only been able to infer dark matter densities over galactic scales so I'm not sure that density applies at planetary system scales. It's like trying to use the density of iron to say where the atoms in a chunk of it are.

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