Click to drop impactors — measure crater radius and depth scaling laws
Granular impact craters follow power-law scaling: crater radius R ∝ (m·v²/ρ_g)^(1/3) where m is impactor mass, v is impact speed, and ρ_g is the grain bulk density. The Pi-group scaling from dimensional analysis collapses data from sand to planetary surfaces over 26 orders of magnitude in energy.