**Cosmic Time Explained — Carl Sagan on the Deep History of the Universe and Its Infinite Age**
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YouTubeCarl Sagan Physics
**Cosmic Time Explained — Carl Sagan on the Deep History of the Universe and Its Infinite Age**
What is cosmic time, and how old is the universe really? Inspired by Carl Sagan, this video takes you on a journey through the deep history of the cosmos—from the birth of space and time to the evolution of stars, galaxies, planets, and life itself. Modern cosmology estimates that the observable universe has existed for approximately 13.8 ...
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