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  1. Space

    Final Hubble repair mission begins

    The final mission to repair and upgrade the Hubble Space Telescope lifted off May 11.

    By Ron Cowen
  2. Astronomy

    New eyes on the cosmos

    The next constellation of telescopes will dramatically extend and sharpen scientists’ view of the universe.

    By Janet Raloff
  3. Life

    Misread epigenetic signals play role in leukemia

    A genetic mistake causes misinterpretation of epigenetic marks, leading to cancer.

    By Tina Hesman Saey
  4. Space

    Sun entering weakest cycle since 1928

    NOAA releases new predictions for solar cycle.

    By Solmaz Barazesh
  5. Animals

    Controversial polar bear rule stands

    Creature’s plight remains separate from decisions on greenhouse gas emissions.