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  1. Astronomy

    Ancient Mars water: A deep source?

    A new analysis of a Mars meteorite that fell to Earth suggests that much of the water believed to have once flowed on the surface of the Red Planet came from eruptions of molten rock that originated deep within the planet.

    By Ron Cowen
  2. Earth

    A Nation Aflame

    In the wake of one of the worst fire seasons in the past 50 years, scientists are assessing risk as more people move into fire-prone areas and developing ways to better predict the behavior of--and the potential for--wildfires.

    By Sid Perkins
  3. Astronomy

    Distant cluster suggests low-weight cosmos

    Lured by the radio beacon of a faraway galaxy, astronomers have discovered the most distant cluster of galaxies known in the universe.