Using a technique that peeks over obscuring rings of dust and gas and into the hearts of distant galaxies, a researcher has found evidence suggesting that as many as half of the bright, active galaxies known as Seyfert 2 galaxies may have significantly less active central black holes.
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Johns Hopkins University. "Study Stirs Old Debate About Galaxies." ScienceDaily. ScienceDaily, 26 June 2001. <www.sciencedaily.com/releases/2001/06/010612070325.htm>.
Johns Hopkins University. (2001, June 26). Study Stirs Old Debate About Galaxies. ScienceDaily. Retrieved April 18, 2014 from www.sciencedaily.com/releases/2001/06/010612070325.htm
Johns Hopkins University. "Study Stirs Old Debate About Galaxies." ScienceDaily. www.sciencedaily.com/releases/2001/06/010612070325.htm (accessed April 18, 2014).