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Illustration made by William Parson in 1945 of the Whirlpool Galaxy.

M51 as drawn by Lord Rosse, 1845

The illustration above is a drawing of the Whirlpool Galaxy made in 1845 by William Parsons, the Third Earl of Rosse. Lord Rosse’s 72-inch telescope enabled him to see the spiral shape of the Whirlpool. Like many astronomers, he drew the bright parts of the image with a dark pencil, making his drawing look like a photographic negative.

More information can be found in the Telescopes From the Ground Up activity.http://amazing-space.stsci.edu/resources/explorations/groundup/lesson/basics/g44/