I originally blogged this series of five spacegirls in this 17 January 2014 post at Infernal Wonders. They are the work of American pinup artist Olivia De Berardinis (b. 1948), who has an official website here. They were introduced on the tumblr Android Ghost, which appears to be gone, but part of which survives in the Internet Archive.
It is by Malcolm Smith, and it was published in Other Worlds Issue #1, November 1949, to illustrate the story The Fall Of Lemuria.
That complete issue can be downloaded here.
The whole post comes to us via doppelgaenger18.