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  1. Planetary Science

    Mars Odyssey instrument revived

    Flight controllers have revived an instrument on the Mars Odyssey spacecraft that measures the amount of radiation bombarding the Martian surface.

    By Ron Cowen
  2. Earth

    Rocks in Earth’s mantle could hold five oceans

    Analysis of minerals created in the laboratory under conditions that simulate those deep within the planet suggests that the zone of rocks just outside Earth's core could hold enough water to fill the oceans five times.

    By Sid Perkins
  3. Earth

    Zooplankton diet of mercury varies

    By modeling a lake ecosystem in large tubs of water, researchers have found that zooplankton—an important link in the food chain—consume much less toxic methylmercury when the lake experiences an algal bloom.