Ep 10. The Edge of Forever

In Cosmos season 1 episode 10, "The Edge of Forever," viewers are taken on a journey through time and space to explore the concept of eternity. Host Neil deGrasse Tyson explains how humans have always been fascinated with the idea of eternity - of existing in a perpetual state without end. He notes that it's a concept that has featured in many different religions and cultures throughout history.

Throughout the episode, Tyson introduces viewers to various historical figures who have grappled with the idea of eternity in their own unique ways. One such figure is Sir Isaac Newton, who believed that space and time were inexorably linked, and that the universe had a set beginning and end. This idea would have major implications for the study of astronomy and physics.

Tyson also discusses the contributions of other scientists who have helped us better understand the nature of time, including Swiss astronomer Fritz Zwicky and physicist Albert Einstein. He explores the concept of "deep time," which refers to the immense time scales of the universe that are difficult for humans to comprehend. For example, the universe is thought to be around 13.8 billion years old, and Tyson explains how measuring this time span has revolutionized our understanding of the cosmos.

The concept of eternity is also explored from a philosophical standpoint. Tyson notes that many people view eternity as a kind of paradise, where everything is perfect and never changes. But he cautions that such a concept may not be as idyllic as it appears on the surface. He quotes philosopher Blaise Pascal, who said, "The eternal silence of these infinite spaces frightens me." Tyson also notes how eternity and mortality are intertwined, as our finite existence makes us acutely aware of the passing of time.

As the episode progresses, Tyson delves deeper into the science of time, exploring theories such as the theory of relativity, which posits that time is relative and can be stretched or compressed depending on one's perspective. He illustrates this concept with a hypothetical scenario involving a pair of twins, one of whom takes a journey through space at high speeds. When the twin returns to Earth, they will have aged less than their sibling who remained on Earth. This demonstrates how time can move at different rates depending on one's position in the universe.

The episode culminates in a discussion of the universe's ultimate fate. Scientists theorize that the universe will continue to expand indefinitely, eventually growing so vast and diffuse that it becomes uninhabitable. Tyson notes that, from a human perspective, this prospect is a bit unsettling, as it suggests that one day the universe may be completely empty and devoid of life. However, he reminds viewers that the universe is a constantly evolving entity, and that we are lucky to be alive at a time when it is still teeming with activity.

Overall, "The Edge of Forever" is a thought-provoking exploration of the human fascination with eternity and the nature of time itself. Tyson's engaging narration and use of creative visuals help to bring these complex concepts to life for viewers. The episode encourages viewers to think deeply about their own place in the universe and the fleeting nature of existence.