Object’s bulk density against equivalent sphere diameter. All lines show the relation for dust aggregates (Equation (4)). The blue and orange lines show ice and silicate dust aggregates, whose material densities are 1.45 and 2.65 g cm⁻³, respectively. The solid and dashed lines show monomer radii of 0.1 and 1.0 μm, respectively. The markers with error bars show MBAs (very light gray dots), NEAs (light gray dots), TNOs (medium gray circles; Table 2), and comets (dark gray triangles; Table 3). The black crosses show a comet (67P; Table 3) and three asteroids (Itokawa, Bennu, and Ryugu; Table 4) that are investigated by in situ measurements.