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Nature Physics 4, 98 (1 February 2008) | doi:10.1038/nphys852

Astrophysics: Rings around the lenses

May Chiao

During a routine Hubble Space Telescope scan for an Einstein ring — a galaxy with a bright ring around it — astronomers noticed a double ring, the first of its kind. The team led by Raphael Gavazzi and Tommaso Treu report their discovery online (http://arxiv.org/abs/0801.1555; 2008).