"Arecibo answer" crop circle —
Photo Credit: https://temporarytemples.co.uk/crop-circles/2001-crop-circles/2001_08_20_the-message-chilbolton-radio-telescope-hampshire-wheat-oh-35mmneg

graphic of Arecibo message — This is a demonstration of the message with color added to highlight its separate parts. The binary transmission sent carried no color information.
Photo Credit: By Arne Nordmann (norro), CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=365130

Carl Sagan —
Photo Credit: https://cosmos.fandom.com/wiki/Carl_Sagan

The 85-foot (26 m) Howard E. Tatel Radio Telescope at NRAO — used in Project Ozma
Photo Credit: By Z22 - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=52713652

UCSC & Santa Cruz aerial view — The Great Meadow is the undeveloped area between city and university
Photo Credit: By Doc Searls from Santa Barbara, USA - sba-cdg13.JPG, CC BY-SA 2.0, https://commons.wikimedia.org/w/index.php?curid=6396583

Original University of California seal —
Photo Credit: By probably Tiffany & Co,; Public Domain, https://commons.wikimedia.org/w/index.php?curid=29175425

logo National Radio Astronomy Observatory —
Photo Credit: https://public.nrao.edu/

Astronomer Frank Drake — speaking at Cornell University in Schwartz Auditorium, 19 October 2017
Photo Credit: By Amalex5 - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=122568884

February 1919 United States news coverage of the unrest in Germany — By US Newspapers - Omaha daily bee., February 22, 1919, Great Falls daily tribune., February 22, 1919, Omaha daily bee., February 23, 1919, The Washington times., February 23, 1919, NATIONAL EDITION
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=79803488

Bavarian Socialist Prime Minister Kurt Eisner —
Photo Credit: By Robert Sennecke - International Institute of Social History, Public Domain, https://commons.wikimedia.org/w/index.php?curid=12525144

Adolf Hitler, Emil Maurice, Hermann Kriebel, Rudolf Hess, and Friedrich Weber at Landsberg Prison —
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=65393042