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The week in pictures: November 24–30, 2012

In the past seven days, MESSENGER found new evidence for water ice on Mercury, astronomers discovered a record-setting X-ray jet, researchers uncovered a giant black hole that could upset galaxy evolution models, and more.

NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington/National Astronomy and Ionosphere Center, Arecibo Observatory

Spacecraft finds new evidence for water ice on Mercury

The new data indicate that the water ice in Mercury’s polar regions, if spread over an area the size of Washington, D.C., would be more than 2 miles thick. Learn more »
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