Labels:autoradiograph | earth | sky | windowpane OCR: 3 Discovery slide. Pluto far too small to perturb Neptune's orbit enough to give away its presence although Percival Lowell made endless calcula tions to find it Clyde Tombaugh found Phuto (magritude 13.5 by systematically taking pictures of the plane of the solar He took pictures in pairs, one or two weeks apart and looked for arything that The idea that planets would appear to shift against the backdrop of stars because the earth had moved taa new viewing angle over the intervering two- -weel period Tombaugl
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