Hasslein Curve

A Hasslein Curve is a theoretical feature of spacetime featured in the Planet of the Apes multimedia franchise. It was referenced in both the 1968 film Planet of the Apes as well as the 1970 movie Beneath the Planet of the Apes, which is where it was first addressed by name. The term is derived from the scientist who first developed it, Otto Hasslein, who is the main antagonist from the third film in the series, ''Escape from the Planet of the Apes'.

A Hasslein Curve is similar to an Einstein–Rosen bridge, and has been identified as "a bend in space". It's unstable topographical existence allows for a body of matter to enter it, whereupon it transports it between the planes of space and time, allowing it to emerge from an exit at a different location or timeline. In the Planet of the Apes films, this is used to explain how astronaut George Taylor left the planet Earth in the 1970s and arrived back on Earth in the latter half of the 40th century.