Original: It is not certain what caused the crash, but a 1986 inquest suggests that the turbulence from a Su-11 'Fishpot-C' interceptor using its afterburners may have caused Gagarin's plane to go out of control.
Simplified: People are not sure what caused the crash, but a 1986 inquest thinks that the turbulence from a Su-11 'Fishpot-C' interceptor using its afterburners may have caused Gagarin's plane to go out of control.