Every known object in the Universe, on a single chart.

This page charts every known object in the universe, plotted by their mass vs physical radius — spanning over 60 orders of magnitude in size and 90 in mass.

Two fundamental limits define the forbidden regions: general relativity's Schwarzschild radius (the size at and below which an object becomes a black hole) and quantum mechanics' Compton wavelength (the smallest scale at which a particle can be localized). At their intersection sits the Planck-mass instanton, the smallest possible object.

Dashed diagonal lines trace isodensity contours through cosmic history, from the Planck epoch (10⁹³ g/cm³) to the present-day universe (10⁻²⁹ g/cm³).