Wednesday, 12 October 2016
around the world;
beneath the sea;
up and out into space;
backwards, forwards and sideways in time;
around a cosmic cycle;
into supernatural realms;
within - psychologically speaking.
That seems to exhaust every possibility, including one or two that may be only imaginary - although fsf fans are always interested to read more. Anderson's ventures "sideways in time" were chiefly fantasies: myths are true, magic works etc. However, his realistic alternative histories are to be found in two short stories and in two installments of the Time Patrol series.
Post-Anderson classics of realistic alternative history include SM Stirling's The Peshawar Lancers and Conquistador. Stirling's Draka History is a brilliant example of the sf principle of imagining an original premise and realizing its logical implications. We must indeed be grateful that a slave-owning culture has not become dominant in our history.