Frank R. Paul

There's a really fun page about the great pulp artist Frank R. Paul's take on life throughout the Solar System at . . .

http://io9.com/alien-life-in-our-solar-system-according-to-pulp-art-l-471363935

Paul had a tremendous visual imagination, and wasn't burdened by too much scientific rigor.  These paintings are all about contact, usually first contact, between humans and aliens.  All but one or two of the human space travelers are armed with pistols.  One has a futuristic version of the lever-action Winchester Model 94, causing a little bit of genre shock.

Joe