Uncategorized

  1. Earth

    Dim View: Darkening skies a regional phenomenon

    The decline in the solar radiation reaching Earth's surface in the latter half of the 20th century turns out to have been mostly a regional phenomenon.

    By Sid Perkins
  2. Planetary Science

    Fresh Mars: Craft views new gullies, craters, and landslides

    A comparison of images taken just a few years apart by a Mars orbiting spacecraft reveals recent landslides, freshly carved gullies, and a 20-meter-wide crater gouged in the planet's surface no earlier than 25 years ago.

    By Ron Cowen
  3. Earth

    Steep Degrade Ahead: Road salt threatens waters in Northeast

    Using road salt to clear icy highways in the northeastern United States is increasingly tainting streams throughout the region.