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
American theoretical physics
Kip Thorne
1940
Caltech relativist, shared the 2017 Nobel Prize in Physics for the LIGO detection of gravitational waves, and a co-founder of LIGO itself. With Michael Morris and Ulvi Yurtsever he showed in 1988 how a traversable wormhole could in principle be turned into a time machine, which reopened serious physics work on causality violation — including his group's collaboration with Novikov on self-consistency.