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# The Core

## How can black holes shine?

You'll need a little bit of quantum physics for this.
We'll explain it:

In quantum physics the empty space isn't empty at all. In it there are always particles flashing into existence and disappear again. They always come in pairs; one particle and one anti-particle, like an electron and a positron, or a photon (a particle of light) and another photon with opposite spin and impulse. These particles are called "virtual particles". They only exist for a very short time:

; where f is their frequency.

 Werner Heisenberg Max-Planck-Institute, courtesy AIP Emilio Segre Visual Archives. This follows out of the Heisenberg principle of uncertainty: where is the energy of the pair of virtual particles, and h is the Planck constant. (a natural constant, ). Jump Calculation

The heisenberg Principle of Uncertainty:

The energy of one photon:

The energy of a pair of photons:

## Let's do some calculations !

Example Calculation:
The life time of a photon of orange light () :

(80 attoseconds, one attosecond is a millionth of a millionth of a millionth of a second.)

``````"Black holes aren't black - After Hawking they shine!"