than 2.2 billion light-years away, for more than 13 hours. The gravity of the cluster’s trillion stars, plus dark matter, acts as a 2-million-light-year-wide “lens” in space. This “gravitational lens” ...
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The first of a set of unprecedented, super-deep views of the universe from an ambitious collaborative program called The Frontier Fields is being released today at the 223rd meeting of the American ...