The year 1909 in science and technology involved some significant events, listed below. == Astronomy == August 20 – Dwarf planet Pluto is photographed for the first time, at the Yerkes Observatory in Williams Bay, Wisconsin, U.S., 21 years before being identified.
The year 1909 in science and technology involved some significant events, listed below. == Astronomy == August 20 – Dwarf planet Pluto is photographed for the first time, at the Yerkes Observatory in Williams Bay, Wisconsin, U.S., 21 years before being identified.
Source: Wikipedia "1909 in science" · CC BY-SA 4.0
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