Why Is 95% Of The Universe Invisible?

How did our universe emerge from a single mathematical point of infinite density? In this episode of SpaceTime, astronaut and scientist Ulrich Walter joins top cosmologists to retrace 13.8 billion years of cosmic history. We investigate the "Dark Ages" of the universe, the violent birth of the first stars, and the mysterious "Dark Matter" that holds galaxies together despite defying the laws of Newtonian physics.

Courtesy of Spark on YouTube. Watch on YouTube ↗

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