Using the world's largest, fully steerable radio telescope--the National Science Foundation's Robert C. Byrd Green Bank Telescope (GBT) in W.Va.--an international team of researchers has given astronomers the promise of a new tool for mapping the universe and gaining valuable clues about the nature of the mysterious "dark energy" believed to constitute nearly three-fourths of the universe's mass and energy. "Intensity Mapping" offers the potential for ...