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5 of the Biggest Puzzles about the Universe

ByGreg KestinThe Nature of RealityThe Nature of Reality

The discovery that light gets redder as its source moves away from Earth led astronomers to uncover some of the universe’s strangest truths, including dark energy, dark matter, and the expansion of the universe.

How well can you read these five clues and decode the universe’s best kept secrets?


This project/research was supported by grant number FQXi-RFP-1822 from the Foundational Questions Institute and Fetzer Franklin Fund, a donor-advised fund of Silicon Valley Community Foundation.