What does DUO stand for?

MLA style: "DUO." Acronym Finder . 2012. AcronymFinder.com 28 May. 2012 http://www.acronymfinder.com/Dark-Universe-Observatory-(DUO).html
Chicago style: Acronym Finder . S.v. "DUO." Retrieved May 28 2012 from http://www.acronymfinder.com/Dark-Universe-Observatory-(DUO).html
APA style: DUO. (n.d.) Acronym Finder. (2012). Retrieved May 28 2012 from http://www.acronymfinder.com/Dark-Universe-Observatory-(DUO).html

Dark Universe Observatory

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Samples in periodicals archive:

The proposed Dark Universe Observatory, a suite of seven Earth-orbiting telescopes, would scan a large chunk of the sky in search of the X rays.