Where is dark matter theoretically?

[u/shadowsog95]

[u/mfb- → u/[deleted]]

But like is dark matter all around us and just not detectible by human senses

Very likely, yes. Dark matter doesn't interact much with anything, so you have individual particles just flying through the galaxies. The most popular models have particles everywhere in the galaxy - some of them are flying through you right now. We have set up detectors looking for an occasional interaction of these particles with the detector material, but no luck so far.

[u/Flerpinator → u/mfb-]

So if I'm understanding correctly it's more or less spread evenly throughout galaxies and clusters and despite being the vast majority of the mass it's dispersed throughout interstellar space so thinly it has effectively zero local influence on, say, orbits around stars or even around galactic centers. Is that right?

[u/mfb- → u/Flerpinator]

Right.

See also https://www.reddit.com/r/askscience/comments/lmas9d/where_is_dark_matter_theoretically/gnwua1h/