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  1. Physics

    Glints from Inner Space: Sensing Earth’s hidden radioactivity

    Physicists have observed signatures of radioactivity deep within Earth, enabling measurement of planet-wide thorium and uranium quantities.

    By Peter Weiss
  2. Humans

    Letters from the July 30, 2005, issue of Science News

    Led astray The illustration of the solar system in “Roaming Giants: Did migrating planets shape the solar system?” (SN: 5/28/05, p. 340) does not represent the current orbit of the planets. Rather, it must be a frame from the computer simulation referred to in the article. William MeadowsDripping Springs, Texas Indeed, the image reflects the […]

    By Science News
  3. Astronomy

    Planet potential

    Observations with the Submillimeter Array on Hawaii's Mauna Kea reveal that, despite their bombardment by a stellar bully, the disks in Orion have enough material to form planets.