The Black Avengers by Vargo Statten (John Russell Fearn). Cover Art: Ron Turner. Scion Ltd, 1953 - A space opera featuring a band of interplanetary outlaws.
The Excelsior - An interplanetary craft from the 1918 Danish film, Himmelskibet (Sky Ship) (In the U.S., Trip To Mars) - Himmelskibet is an anti-war film and one of the first to be made in the 'space opera' genre. (photo via monstersforsale)
Source: flickr.com