The podcast episodes provided focus on various aspects of comets, including their composition, behavior, and notable appearances such as the Hale-Bopp comet.

The episodes 'EXTRA EPISODE! - There was an Old Astronaut who Swallowed the Moon' and 'There Was an Old Astronaut Who Swallowed the Moon' from the 'Ryers Readers' podcast cover the topic of comets, describing what they are, their composition, and their behavior when approaching the sun.

The episode 'The Hale-Bopp Comet' from the 'History Daily' podcast specifically focuses on the Hale-Bopp comet and its appearance in 1997.