A spacetimesingularity with an event horizon on the order of a Planck length (~ 10-35metre), and a mass on the order of a Planck mass (~ 20 microgram), whose only possible decay route is emitting a single photon of Hawking radiation of that rest mass as energy, but thus disallowed by quantum physics transition prohibition, which becomes stable and everlasting if it does not absorb anything.
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