As a summer student at Kitt Peak Observatory in 1974, I had the honor of working with Art Hoag. Not just a brilliant astronomer and a super efficient observer. Art was a true gentleman of the old school: kind to students and quite progressive. Forty five years ago, over night-lunch at the observatory, he told us of the importance of bringing into astrophysics more women, minorities, gays, and foreign students.
Very cool that there’s a second ring galaxy you can see by looking through the first one! And here I was not even knowing ring galaxies existed until today!
A somewhat bigger Ringworld? <a href="https://www.wikiwand.com/en/Ringworld" rel="nofollow">https://www.wikiwand.com/en/Ringworld</a> Which, by coincidence, I am currently re-reading.