A Legion Of Walruses, Hidden Moon Valleys, And Other Amazing Images Of The Week

Plus a truly psychedelic supernova, like whoa
Dramatic sea ice loss caused Pacific walruses to come ashore in record numbers in September. The National Oceanic and Atmospheric Administration (NOAA) spotted an estimated 35,000 walruses on Alaskan beaches during their annual arctic marine mammal aerial survey. AP Photo/NOAA, Corey Accardo

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Win the Holidays with PopSci's Gift Guides

Shopping for, well, anyone? The PopSci team’s holiday gift recommendations mean you’ll never need to buy another last-minute gift card.