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The week in pictures: February 25–March 2, 2012

In the past seven days, a dark matter clump defied explanation, astronomers discovered oxygen in saturnian moon Dione's exosphere, a Mars imager celebrated a decade of work, the Very Large Telescope rediscovered life on Earth, and more.
NASA/ESA/CFHT/CXO, M.J. Jee (Univ. of California, Davis)/A. Mahdavi (San Francisco State Univ.)

Dark matter core defies explanation in NASA Hubble image

New results from NASA's Hubble Space Telescope confirm that dark matter and galaxies separated in Abell 520 instead of staying anchored together, as predicted. Learn more »

"The week in pictures" highlights the amazing discoveries and cutting-edge research that resulted in magnificent photos and illustrations in the past week's Astronomy.com News section. Scroll through the photos, comment on your favorites, and click links to learn more about the science behind the pictures. We hope "The week in pictures” will not only highlight all our beautiful universe has to offer but also summarize the important stories of the past seven days in case you missed anything.

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