
Ever since the discovery of the eighth planet, Neptune, astronomers speculated about a possible ninth planet. Some, like American Percival Lowell, used mathematical analysis of the orbit of Uranus to trace the undetected planet’s gravitational effects.
In 1930, astronomer Clyde Tombaugh, building on Lowell’s work, discovered the ninth planet. Or did he? (This is a special Christmas episode of the podcast.)
(Correction: Clyde Tombaugh received his degrees in astronomy from the University of Kansas. In an earlier version of this episode, I mistakenly said they were from Kansas State University. I apologize for the error, and the podcast and transcript have been corrected.)
- Listen now:
Playlist:
Fanfare
Opening Theme
eDream
Closing Theme
Except when otherwise indicated, the contents of this podcast are © and ℗ 2015, 2016, 2017, 2018, 2019, 2020, 2021 by Mark Painter, all rights reserved. Some music and sound effects used by arrangement with Pond 5.








