The Comet is a zine that was first published in 1930.
The Comet was edited by Raymond Arthur Palmer and published by the Science Correspondence Club. As the name of the publishers suggests, it has its origins in correspondence between science fiction fans. Naturally, the letter section of The Comet was a prominent feature of the zine, where readers discussed issues concerning science, science fiction and fiction.
Other science fiction zines following in the wake of The Comet included Time Traveler and Science Fiction, noteworthy by virtue of being edited by Jerome Siegal and Joe Shuster, the creators of Superman.
Raymond Palmer went on to edit Amazing Stories and Fantastic Adventures and a number of other magazines issued by his own publishing company.