Bruce Murray Space Image Library
The dynamic Martian surface
Filed under pretty pictures, history, Mars, optical telescopes
This scan of page 268 from Astronomy
shows the clearest visual data available on Mars in 1935. Top: drawings of the Martian "canali" by Percival Lowell. Middle: seasonal changes on the planet's surface observed from May 10 to July 19, highlighting the alleged vegetation patches. Bottom: spectrograph comparisons of Mars and the Moon, used to make measurements of Mars' atmospheric composition.
Astronomy, John Charles Duncan. Harper & Brothers Publishers, New York/London, 1935
Original image data dated on or about July 19, 1935
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