Cosmology was the club organ of the Science Correspondence Club, first published in May 1930.

The first issue was called The Comet, and is often considered to be the first science-fiction fanzine ever published. As the name of the publisher suggests, it had its origins in correspondence between people with an interest in science. In the letter column, a prominent feature of the zine, readers discussed issues concerning science, science fiction and fiction. (However, since Cosmology's contents through 17 issues were more about the science in the stories rather than the fiction, some fanhistorians argue that the Scienceers' clubzine, The Planet actually rates as the first real fanzine. The disagreement echoes that as to whether the SCC or the Scienceers was the first fanclub.)

The Comet's first editor was Ray Palmer (who incidentally went on to edit Amazing Stories and give us the shameful Shaver Mystery in the 1940s). Palmer and Walter Dennis were the initial publishers. Contributors to this first issue included Lilith Lorraine, among others.

After the first issue, the title changed to Science Correspondence Club Organ for the second and third issues. The fourth issue was titled Science Correspondence Club Bulletin. After the fourth issue (September 1930), A.W. Gowing assumed editorship, and changed the title to Cosmology, the title it retained until the 17th and final issue (1933). Editorship changed hands once again for the final four issues, to Aubrey McDermott and Clifton Amsbury.

Because of the number of issues published as Cosmology, the series as a whole is most commonly referred to by that title; in their Fanzine Index, for instance, Pavlat and Evans catalogue all 17 issues under Cosmology.