How to Discover a Galaxy with a Telephoto Lens

Like countless so-crazy-it-just-might-work schemes, this one began with a gripe session. In the fall of 2011, Roberto Abraham and Pieter van Dokkum were commiserating at a Nepalese restaurant in Toronto. Over curry and rice—and a generous quantity of beer—the old friends bemoaned a problem they’d discussed many times before. As observational cosmologists, they shared a professional interest in how galaxies are born and evolve.
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