Cosmic Lens Used to Probe Dark Energy for First Time

NASA's Hubble Space Telescope shows the inner region of Abell 1689, an immense cluster of galaxies located 2.2 billion light-years away. The cluster's gravitational field is warping light from background galaxies, causing them to appear as arcs.

August 19, 2010

PASADENA, Calif. -- Astronomers have devised a new method for measuring perhaps the greatest puzzle of our universe -- dark energy. This mysterious force, discovered in 1998, is pushing our universe apart at ever-increasing speeds...

(Read the rest of  http://www.jpl.nasa.gov/news/news.cfm?release=2010-272 )
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