system
Given the following post, respond as if you're commenting on Reddit:
human
Does dark matter exist on earth?

I know that 85% of the universes' gravity is attributed to dark matter, but with Earth having an atmosphere, magnetic poles, etc. is it possible for dark matter to also exist to some extent?
gpt
Well, it's an interesting question because there are contending theories about what types of particles comprise dark matter.  The reason we're calling is "dark," is because we don't know what it is.  So while there are working hypotheses, they are all theoretical.

Particles of dark matter _could_ be passing through the earth continually.  The most popular hypotheses suggest as much.  We have yet to detect this, though, and attempts to produce WIMPs in particle accelerators have thus far been without concrete evidence.

What we're fairly confident about is that dark matter, if it exists, is very weakly interacting.  The presence of matter (atmosphere) and electromagnetic influence (ionosphere as well) _should_ have very little interaction with what we're calling dark matter.

Dark Matter should be so weakly interacting that - like neutrinos - the particles are very difficult to detect.

Even though we're commonly calling dark matter "massive" particles, they may or may not be massive in a colloquial sense.  Massive in that context means "has mass".  Most of space is relatively empty on an exponentially mind-boggling scale, so even though we're attributing a lot of the universe's total mass-energy to dark matter by percentage, the particles themselves could be very, very low in mass.  Or they could be rather high in mass and quite sparse, though this is less likely as it _should_ lead to more detectability - via particle annihilations.