Galaxy Zoo: ‘Hanny's Voorwerp’, a quasar light echo?
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author: Chris Lintott, Kevin Schawinski, William C. Keel, Nicola Bennert, Edward M. Edmondson, Daniel Thomas, Daniel Smith, Shanil Virani, Dan Andreescu, Steven Bamford, Kate Land, Phil Murray, Robert C. Nichol, M. Jordan Raddick, Anže Slosar, Alex Szalay, Jan Vandenberg
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