Summary
In this episode of StarTalk Cosmic Queries, the topic of time travel is explored in depth, with theoretical physicist Brian Greene as the guest. The discussion delves into the concept of time before and after Einstein's theory of relativity, with a focus on how time is more individualistic than previously thought and how gravity affects the passage of time. They also touch on the idea of self-consistency and how events in time cannot be changed, as they are part of an immutable timeline.
The hosts also discuss time travel in movies, with a particular focus on the accuracy of time travel in Interstellar and the concept of wormholes as a means of time travel. They clarify that time travel involves a change in the ticking of the clock and not a change in the physiology of the traveler. Additionally, they explore the idea of information and entropy in relation to time travel.
The potential for paradoxes in time travel is also discussed, along with the concept of tachyon particles and the importance of considering the movement of the universe when calculating a trajectory. The hosts also explore the idea of different universes and parallel realities, and how time travel could potentially allow us to witness these alternate realities.
Finally, the hosts joke about giving Brian his own segment on the show, bringing a lighthearted end to the thought-provoking discussion of the complexities of time travel. Overall, the episode offers an informative and entertaining exploration of the topic.
