Yerkes Observatory

Yerkes Observatory

Yerkes Observatory
Drawing, Orbit of Planet X 1
II: Buildings and Grounds
Drawing (photograph copy) of Planet X's orbit by Yerkes Observatory astronomer William D. MacMillan. Lowell Observatory astronomers believe X is a comet rather than a planet because of its elliptical orbit.
MacMillan, William Duncan, 1871-1948 | Lowell Observatory | Drawings (Visual works) | Planets | Comets | Elliptical orbits
Photographic prints; 18.5 x 23.3 cm
MacMillan William Duncan, 1871-1948
Archival Photographic Files
University of Chicago Library, Special Collections Research Center

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