what a pity the artist did not choose to have a hole in the middle of the coin surrounded by an accretion disk. With tbe aid of a magnifying glass one may also see the Hawking formula for the entropy of a black hole. The obverse of the coin shows an artist's impressionof a black hole. In 2019 the Royal Mint produced a commemorative 50 pence coin to celebrate Stephen's life. Notice that it is approximately equal to the mass of our Moon and has the diameter of a human hair! Now it is easy to work out the mass of tbe Black Hole whose temperature equals that of tbe Cosmic Background Radiation. The Cosmic Microwave Background radiation temperature = 2.725 deg K Given that the above are all constants the temperature equation may be reduced to: Those, like me, who enjoy doing calculations will need to know the values of the various constants so here they are: I had always understood that it was this latter formula that Stephen wished to have as his epitaph!įor more information as to the significance of this formula listen to my radio interview It is the only formula I know which incorporates both Classical Constants and Quantum Constants.Īctually, Hawking's somewhat similar formula for the Entropy of a Black Hole also does this. Stepehen's temperature formula is most remarkable.
Subsequent anslysis led to a change of mind after which Stephen persued the subject with enthusiasm. Suggested that there should be thermodynamics of black holes Stephen was one of his detractors. Stephen was never afraid of an arument and never shy of a controvesy. Stephen Hawking's formula for the temperature of a Black Hole is inscribed on his tombstone in Westminster Abbey and also on one of my tee shirts. His formula for the temperature of a Black Hole
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