The topic of Planetary Orbits is central to the podcast episodes provided, as they delve into the science behind the narrative elements of the science fiction series "The Three-Body Problem".

The first episode, "Could '3 Body Problem's Aliens Exist? The Science Behind Netflix's New Hit", explores how the concept of the three-body problem, with its inherent unpredictability, is a key part of the show's premise and has implications for understanding potential alien civilizations.

The second episode, "Planet X", discusses the search for an undiscovered planet that could be influencing the orbits of objects in the outer solar system, further highlighting the complexities of planetary dynamics.