Hawking radiation
Hawking radiation is radiation that black holes emit due to quantum effects near their event horizon, the boundary from which nothing can normally escape. Discovered theoretically by Stephen Hawking in 1974, this radiation arises from quantum fluctuations at the horizon. Unlike the classical view of black holes as completely dark objects, Hawking radiation shows they actually leak energy and gradually shrink. Smaller black holes emit radiation faster than larger ones, eventually evaporating completely. Although the theory is well-established, detecting Hawking radiation remains observationally challenging because real black holes emit it so faintly. This discovery fundamentally changed our understanding of black holes, revealing they have temperature and entropy, which bridges quantum mechanics and gravity.
Sources
- en.wikipedia.org: “Hawking radiation is radiation released outside a black hole's event horizon due to quantum effects according to a model developed by Stephen Hawking in 1974.”
- en.wikipedia.org: “Hawking radiation would reduce the mass and rotational energy of black holes and consequently cause black hole evaporation.”
- en.wikipedia.org: “Hawking radiation is predicted to be extremely faint and is many orders of magnitude below the current best telescopes' detecting ability.”