ergosphere

== English == === Etymology === From ergo- +‎ -sphere. Coined by Remo Ruffini and John Archibald Wheeler in 1971 in reference to the fact that it is theoretically possible to extract energy from the region. === Pronunciation === === Noun === ergosphere (plural ergospheres) (physics) A region outside the event horizon of a rotating black hole in which space and time are distorted by shear forces. ==== Derived terms ==== ==== Translations ====