"Space time is accelerating between galaxies faster and faster," says Brian Nord, an astrophysicist and research associate at Fermilab, the particle physics laboratory in Illinois. Nord and his colleagues aren't just astrophysicists, though—as a new exhibit based on their scientific work proves, they're also unlikely artists.
Nord is explaining the concept of dark energy, an unknown energy form that has the opposite gravitational pull to ordinary matter. It's hypothesized to be the reason why the expansion of the universe is speeding up—a discovery made by two teams of astronomers in 1998—though scientists still haven't been able to prove it.
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