I honestly can't tell if you're impressed we've measured the gravitational interaction of something that small, or staggered by our inability to measure a feature of things so large that you can easily hold them in your hand.

"The current best estimate for the mass of Earth is M⊕ = 5.9722 × 10^24 kg" (wiki) so ~6 × 10^27 grammes, so 90mg ~ 28 orders of magnitude smaller. So very, very much the former.