The largest 3-D map yet of the universe's huge galaxies and bright black holes may serve as a springboard toward solving some of astronomy's greatest mysteries, its creators say. The map, which was released Wednesday, uses new data to reveal the locations of more than a million galaxies over a total volume of 70 billion cubic light-years. (A light-year is the distance light travels in one year — about 6 trillion miles, or 10 trillion kilometers.)

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