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  1. Physics

    Muffled shots tell a lot about snow

    A snowfield muffles gunshots in a way that can now be used to reveal important traits of the snow.

    By Peter Weiss
  2. Astronomy

    Cassini at Jupiter: Eyeing the Io torus

    The Cassini spacecraft has captured the most detailed images ever taken of the Io torus, a doughnut-shaped ring of charged particles that surrounds Jupiter and is replenished by the planet's moon Io.

    By Ron Cowen
  3. 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.