The Permissible Universe
A map of everything that can exist
An interactive mass-radius diagram showing ~200 cosmic objects from quarks to supermassive black holes. Objects are positioned according to fundamental physical limits - the Schwarzschild radius, electron degeneracy pressure, Compton wavelength, and Hubble radius. The boundaries show where nature draws the line.
INTERACTIVE MASS-RADIUS DIAGRAM - CLICK ANY OBJECT FOR DETAILED EXPLANATIONS
[Placeholder: Nature Has Rules]
[Content pending: Explain the central idea - not everything is possible. Physics imposes boundaries on what can exist. You can't have an object denser than a black hole. Quantum mechanics prevents structures below a certain size.]
[Connect to familiar constraints - perhaps building codes limiting building height, or material strength limiting bridge spans.]
[Placeholder: The Schwarzschild Boundary]
[Content pending: Explain the black hole line - above this boundary, gravity overwhelms all other forces. Nothing can exist here without collapsing into a black hole. This is the ultimate density limit.]
[Placeholder: Electron Degeneracy]
[Content pending: Explain the white dwarf limit - quantum pressure from electrons prevents further collapse. This creates the diagonal stripe of white dwarfs and neutron stars. Without this, all stars would become black holes.]
[Placeholder: The Quantum Limit]
[Content pending: Explain the Compton wavelength - below this scale, quantum mechanics dominates. You can't localise a particle more precisely without creating new particles. This is why fundamental particles cluster at the bottom left.]
[Placeholder: The Map of Possibility]
[Content pending: Consolidate - this diagram is a map of physical possibility. The empty regions aren't empty because we haven't found objects there - they're empty because the laws of physics forbid them. Understanding these boundaries is understanding the universe's operating system.]
Going Deeper
For the curious - you've got the main idea, this is extra.
[Placeholder: The Hubble Radius]
[Content pending: Explain the cosmological limit - the Hubble radius marks the edge of the observable universe. Objects larger than this would have horizons receding faster than light. This boundary is dynamic - it grows as the universe ages.]