103 - The Tenth Planet

Hypothetical planets are those theorized to exist, whether by observation or prediction by means of examining gravitational fields. Several hypotheticals are discussed, with the story of the planet Vulcan, at one time thought to exist between Mercury and the Sun, discussed in-depth.

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Opening music from https://filmmusic.io. "Dark Child" by Kevin MacLeod (https://incompetech.com). License: CC BY (http://creativecommons.org/licenses/by/4.0/)

Closing music by Soma.