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  1. Earth

    Warm arctic summer melted much ice

    Satellite observations of the Arctic Ocean show that the amount of sea ice there this year was the lowest it's been in more than 20 years.

    By Sid Perkins
  2. Planetary Science

    Fresh crater found on lunar images

    Scientists analyzing images of the moon's surface taken from lunar orbit believe they've identified the crater that formed when a small asteroid slammed into the moon almost 5 decades ago.

    By Sid Perkins
  3. Planetary Science

    Fresh crater found on lunar images

    Scientists analyzing images of the moon's surface taken from lunar orbit believe they've identified the crater that formed when a small asteroid slammed into the moon almost 5 decades ago.