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  1. Astronomy

    The most distant rotating galaxy hails from 13.3 billion years ago

    Astronomers have spotted a rotating galaxy whose light comes from just 500 million years after the Big Bang.

    By Lisa Grossman
  2. Animals

    Tardigrades could teach us how to handle the rigors of space travel

    Tardigrades can withstand X-rays, freezing and vacuum. Now researchers are learning how they do it, with an eye toward human space travel.

    By Douglas Fox
  3. Health & Medicine

    Two pig hearts were successfully transplanted into brain-dead people

    The transplants kept the patients’ blood flowing for three days and are an early step in figuring out if the procedure might work in living people.