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  1. Earth

    Delaware-sized iceberg breaks off Antarctic ice shelf

    An iceberg about the size of Delaware splintered from the Larsen C ice shelf in one of the largest calving events ever recorded.

    By Ashley Yeager
  2. Astronomy

    Teensy star vies for title of smallest known

    A Saturn-sized star is one of the smallest yet discovered.

    By Emily Conover
  3. Astronomy

    Astronomers get glimpse of star 9 billion light-years away

    A bright blue star sends its light from two-thirds of the way across the universe, thanks to a chance alignment with a galaxy cluster.

    By Lisa Grossman
  4. Health & Medicine

    The fight against gonorrhea gets a potential new weapon: a vaccine

    A vaccine used in New Zealand to curb meningitis also appeared to drop gonorrhea infections, results that hint at a way to make a gonorrhea vaccine.