Planck units
Natural units for length, time, energy and mass, obtained by combining the fundamental natural constants that govern spacetime, the strength of gravity and the quantum world: the gravitational constant, Planck's constant and the speed of light. See: Planck ...
Planck time
Natural interval of time that can be obtained by combining the fundamental natural constants that govern spacetime, the strength of gravity and the quantum world: the gravitational constant, Planck's constant and the speed of light. It amounts to about ...
Planck mass
Natural unit of mass that can be obtained by combining the fundamental natural constants that govern spacetime, the strength of gravity and the quantum world: the gravitational constant, Planck's constant and the speed of light. Compared with the masses we're ...
Planck length
Natural length that can be obtained by combining the fundamental natural constants that govern spacetime, the strength of gravity and the quantum world: the gravitational constant, Planck's constant and the speed of light. It amounts to roughly 1.6·10-35 ...
Planck energy
Natural unit of energy that can be obtained by combining the fundamental natural constants that govern spacetime, the strength of gravity and the quantum world: the gravitational constant, Planck's constant and the speed of light. Whenever elementary ...
Pierre Auger Observatory
An observatory in western Argentina built to study high energy cosmic rays. From the viewpoint of relativity, one interesting aspect of this is the possibility that such cosmic rays might produce miniature black holes (see the spotlight text Particle ...
photon
Synonym: light particle, light quantum. In quantum theory, light is not a continuous electromagnetic wave, but a steady stream of tiny energy packets - ...
photon radius
In a certain distance from a spherically symmetric black hole, the deflection of light because of the black hole's gravity is so great that light can move on closed circular orbits - photons (light particles) can, at this distance, orbit the ...
