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Magazine > Back Issues > 2007

Cosmic Efforts Shed Light on Dark Universe
You may know that the universe is expanding; Edwin Hubble discovered that in 1929. But did you know that the expansion is speeding up? Astronomers discovered this astonishing, counter-intuitive fact in 1999, and called the unknown cause "dark energy." Today, teams of cosmologists and engineers across the globe are working on ways and means to study this mysterious force. The race to define dark energy is on, and the winners will be able to claim they ushered in a new era in our understanding of the cosmos.

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