My original tumblr post was here. This image was originally published on tumblr by pulpbizarre. It is the cover of the September 1945 issue of Planet Comics, for which there is a Grand Comics database entry here.
My original tumblr post was here. This is the cover of Innovation Comics Lost in Space Annual #1, and you can find more details about the issue at the publication’s ComicVine page. I found tweeted by Knowing Flame Comics, but the tweet in particular seems to have disappeared.
My original tumblr post was here. I’ve been unable to identify the provenance of this image even with what looks like a fairly recent signature in its lower right-hand corner, but it was originally posted on tumblr by Space Bitches and comes to us via A guy and his blog.
My original tumblr post was here. This image was originally posted by Vintage Geek Culture. This is the cover for the November 1950 edition of Super Science Stories; the ISFBD entry for the issue is here. The cover is by H.R. van Dongen.
My original tumblr post was here. This image was originally posted on tumblr by Vintage Geek Culture with an attribution to Aaron Lopesti, an artist for whom I haven’t been able to find too much on the web, although there is a Pinterest gallery here.
Note also: an almost realistic-looking space costume for once.
My original tumblr post was here. I found this illustration tweeted by Humanoid History with the explanatory text “Amazing promotional art for Ishiro Honda’s 1957 #scifi film THE MYSTERIANS.”
My original tumblr post was here. This is the December 1950 cover of Out of this World Adventures, a pulp magazine that was edited by Donald A. Wolheim and appears to have only had two issues; the ISFDB entry for the magazine is here. I found the cover tweeted by Victor M. Luoma. I’ve been unable to ascertain the identity of the artist, but I did find a larger version of the same image at Retrospace.
My original tumblr post was here. This image was posted on tumblr by The Vault of Retro Sci-Fi and attributed to Frank Kelly Freas.
My original tumblr post was here. These images were originally posted on tumblr by Diabolik Diabolik and identified as being from Planet Stories #11, 1942 (that would be Summer 1942; the ISFDB link for the issue is here), with an attribution of the cover art to Norman Saunders and the interior art to Winfield Scott Hoskins. The post comes to us via paranormallust-eroticart.
My original tumblr post was here, with the illustration originally placed on tumblr by Vintage Geek Culture. The artist is Brogan Coral, who has a site here.