The discussion explores the existence of the past in relation to the universe, emphasizing that we perceive the past through light that takes time to reach us, suggesting that nothing we see truly exists in the present. It highlights the complexity of time perception, noting that our consciousness processes events with a delay, making the present elusive. The conversation touches on Einstein's theory of relativity, which indicates that time flows differently based on gravity and velocity, complicating our understanding of time and existence. Participants also speculate on the nature of memory and how personal beliefs can alter perceptions of past events. Ultimately, the dialogue suggests that while the past may not exist physically, it remains a significant part of our consciousness and reality.