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  1. 19161

    You are usually pretty good at explaining things to those of us outside the hard sciences, but the speed of gravity? Speed of light OK, but what is the speed of gravity? Robert L. SchragNorth Carolina State UniversityRaleigh, N.C. An object with mass creates a gravitational field around itself. Imagine that the object moves; then, […]

    By Science News
  2. Physics

    Clocking gravity

    The first attempt to measure the speed of gravity finds it roughly equal to that of light, as expected, though not everyone agrees that the method used can actually measure gravity's speed.

    By Peter Weiss
  3. Earth

    Contraceptive ring could pose risks after its disposal

    Discarded vaginal contraceptive rings could interfere with fishes' reproduction by releasing estrogen into streams.