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It's Okay to Be Smart
Measuring the Universe With a 14-Billion Light-Year Ruler
Season 12
Episode 4
Since the time of the ancient Greeks, scientists have been constructing a cosmic measuring tape to measure the universe from our own backyard all the way to its ever-expanding edge: the cosmic distance ladder. In this video, we climb that ladder and explore how each rung has revealed something new and previously unthinkable about the universe we live in.