The Grandfather Paradox
Travel back in time and stop your own grandparents from ever meeting. Then who was it that went back?
1943 (Barjavel's novel), with antecedents from the 1920s18 min read
British theoretical physics
Stephen Hawking
1942 – 2018
Cambridge theorist who, with Roger Penrose, proved the singularity theorems of general relativity, and who then showed in 1974–75 that black holes radiate and therefore have a temperature. He spent the following three decades arguing — first for, then against — the conclusion that this radiation destroys information. Diagnosed with motor neurone disease at 21, he worked for more than fifty years afterwards and wrote "A Brief History of Time" (1988).
2 entries
The Black Hole Information Paradox
Physics insists information can never be destroyed. Black holes appear to destroy it. Both of those cannot be true.
1974/75 (Hawking radiation), 1976 (the paradox stated)24 min read