The second promotional comic I wanted to share is Journey to the Sun. It is also from Boys’ and Girls’ March of Comics and the only other one I've found that is about space flight. It was handed to customers of stores that sold Little Yankee Shoes.
Journey to the Sun is a story about a mission to get close enough to the sun with some instruments to make some important measurements. They use ion propulsion to get there and actually use a solar sail for braking as they approach the sun. Of course things go wrong and the astronauts are subjected to high heat (and drama.) In the end they use the known melting points of several metals to measure their distance from the sun so they can complete their mission. A much more scientific story than I expected.
Journey to The Sun. (Promotional comic.) Boys’ and Girls’ March of Comics, #219. Poughkeepsie, NY: Western Printing and Lithographing Co. (18 p.) 1961.