I'll be cautious in asking my my question because I'm out of familiar territory. But... Given the following: that dark matter interacts with baryonic matter (exclusively?) via gravity, that evidence for dark matter shows that it exists largely near baryonic matter, and we are (almost?) certain we're entirely unable to measure it presently... How do we know dark matter hasn't influenced our current measurements of gravitation on earth? It's true that we can be confident is our mass-matter relationship understanding, but couldn't our gravity-mass relationship be skewed if we're getting a constant hum of "background gravitation"?