Sagan discusses the story of the Heike crab and artificial selection of crabs resembling samurai warriors, as an opening into a larger discussion of evolution through natural selection (and the pitfalls of intelligent design). Among the topics are the development of life on the Cosmic Calendar and the Cambrian explosion; the function of DNA in growth; genetic replication, repairs, and mutation; the common biochemistry of terrestrial organisms; the creation of the molecules of life in the Miller-Urey experiment; and speculation on alien life (such as life in Jupiter's clouds). In the Cosmos Update ten years later, Sagan remarks on RNA also controlling chemical reactions and reproducing itself and the different roles of comets (potentially carrying organic molecules or causing the Cretaceous–Paleogene extinction event).

Narrated by Morgan Freeman, this ambitious documentary series unfolds the extraordinary story of the universe across millions of years, weaving together its deep connection to life on Earth. In the first part of the series, we offer the first three episodes, beginning with an intense exploration of the sun as a life-giving force, following one cheetah’s hunt for survival across the vast plains of the Serengeti. From there, we witness the steady pulse of the universe through the eyes of a chimpanzee, tracing life’s path from birth to a final moment of calm. Finally, we immerse ourselves in the challenging year of an Alaskan brown bear as it endures the harsh winter, emerging into the warmth and renewal of summer. Each scene offers a breathtaking glimpse into the delicate and awe-inspiring rhythms of life, nature, and the cosmos.

In the captivating second part of “Our Universe”, chapters 4 to 6 are presented together in an unmissable journey through the cosmos and life on Earth. These episodes delve deep into the elements that formed our world, the essential role of water, and the unseen forces that shape our lives. They offer an enthralling exploration of our place in the Universe. Dive in to experience this profound story of existence, from stardust to soulmates.
In the fourth chapter, we uncover how the elements essential to life were forged in the hearts of stars. Following a green sea turtle’s quest across the ocean for these elements, this episode reminds us that life is built from the remnants of ancient stars. The fifth chapter takes us back to the miraculous arrival of water on Earth, exploring how this vital substance transformed a barren landscape into a thriving blue planet. In the final chapter we witness gravity’s grand influence on life, following two king penguins as their journey of attraction and survival unfolds against the cosmic force that binds us all.

The tenth season of this acclaimed series. A users guide to the cosmos from the big bang to galaxies, stars, planets and moons. Where did it all come from and how does it all fit together. A primer for anyone who has ever looked up at the night sky and wondered.
In the first episode, new astronomical research is beginning to reveal an invisible scaffold of dark matter known as the Cosmic Web, an intergalactic network that transformed the Universe from a chaotic Big Bang into the structured beauty of the present day cosmos.

An ancient bronze disk adorned with gold may contain the oldest images of the cosmos ever discovered; using new research and the latest tech, experts investigate if this artefact could be the work of a prehistoric astrologer. Is it just a decorative disc or is there some hidden meaning?
A strange 11,000-year-old deer skull can have links to a British Atlantis.

Could time travel ever be science fact? Time itself may be something you can bend and stretch. Trying to understand if time travel can be possible teach us a lot about the universe. It forces us to take on some of the toughest unanswered questions in all of physics and will ultimately probably lead to deeper understanding of the very nature of the cosmos.