The concept of time dilation, where time appears to slow down near massive objects like black holes or at relativistic speeds, is a central theme in several of the podcast episodes provided.

In the episode Traveling Through Space and Time, with Janna Levin, the implications of time dilation for interstellar travel and the subjective experience of time for travelers are discussed. Similarly, the episode 1000 Hour Energy explores hypothetical thought experiments around time dilation near black holes or at relativistic speeds.

The episode Spacetime delves deeper into the effects of time dilation, where the passage of time is perceived differently by observers in different frames of reference, as a key aspect of the broader concept of spacetime.