Armin Otto Leuschner
Videos
Armin Otto Leuschner was an American astronomer and educator.
Leuschner around 1920
Leuschner at the Fourth Conference International Union for Cooperation in Solar Research at Mount Wilson Observatory, 1910
Planets beyond Neptune
Videos
Following the discovery of the planet Neptune in 1846, there was considerable speculation that another planet might exist beyond its orbit. The search began in the mid-19th century and continued at th
Armin Otto Leuschner
…Astronomical Union's committee on comets and minor planets for two decades. Leuschner was one of the first astronomers to dispute Pluto as being Planet X as predicted by Lowell. By 1932 he was already suggesting that Pluto had a mass less than the Earth, and that the discovery of Pluto was an accidental…
Percival Lowell, originator of the Planet X hypothesis
Jacques Babinet, an early proponent of a trans-Neptunian planet
Clyde William Tombaugh
Discovery image of Charon