September 9

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  1737: Physician and physicist Luigi Galvani born. In 1780, he will discover that the muscles of dead frogs' legs twitch when struck by an electrical spark.

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  1947: First case of a computer bug being found: A moth lodges in a relay of a Harvard Mark II computer at Harvard University.

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  1975: Viking program: Viking 2 launched. Following a 333-day cruise to Mars, the Viking orbiter will begin returning global images of Mars.

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  2003: Theoretical physicist and academic Edward Teller dies. He is known colloquially as "the father of the hydrogen bomb", although he did not care for the epithet.

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  2017: Dennis Paulson of Mars celebrates the forty-second anniversary of the launch of the Viking 2 spacecraft.

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  2018: Updated version of Embassy published. "The old version was so dark, it was barely visible. This version is much more to my taste," says artist Karl Jones.