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STRINGS OBSERVED: EXHIBIT A
In 1979, radio astronomers found the Double Quasar, Q0957+561A/B, in Ursa Major. A foreground galaxy cluster creates two identical images of the same quasar separated by 5.7''. This was the first confirmed gravitational lens, and it has played a pivotal role in astronomers' understanding of the phenomenon.
In August 2004, a team...
