Show HN: The Universe in One Chart
2 days ago
- #cosmic scales
- #fundamental limits
- #Planck physics
- The plot spans over 60 orders of magnitude in size and 90 orders in mass, charting the full range of objects in the universe by their mass versus physical radius.
- Two fundamental limits define forbidden regions: the Schwarzschild radius from general relativity (below which an object becomes a black hole) and the Compton wavelength from quantum mechanics (the smallest scale for particle localization).
- The intersection of these limits marks the Planck-mass instanton, described as the smallest possible object.
- Dashed diagonal lines represent isodensity contours, tracing cosmic history from the Planck epoch (around 10^93 g/cm³) to the present-day universe (approximately 10^-29 g/cm³).