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Star Man: A Visual Look at the Visible Sky by Jake Ryan
Astronomy Cartoons by Sidney Harris
Space Cartoons by Vlad Kolarov
Physics and Astronomy online recommends Rick London as do I.
Cartoon by Randall Munroe
His website: www.xkcd.com. He also has web store.Creative Commons License
Nick Kim's work includes Astronomy, Alien, Dr. Who and Science cartoons. His website is Nearing Zero.
Space and Alien Cartoons by Australian Mark Godfrey on him smug mug page.
Chris Madden' s work includes Moon, Outer Space and Science Cartoons. He is British.