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  1. Planetary Science

    New clues in search for Planet Nine

    Lots of unknowns remain as researchers try to pin down where a possible ninth planet might be hiding in the solar system.

    By Christopher Crockett
  2. Planetary Science

    The Juno spacecraft is now in orbit around Jupiter

    NASA’s Juno spacecraft successfully entered orbit around Jupiter, beginning a 20-month investigation of the giant planet’s interior.

    By Christopher Crockett
  3. Planetary Science

    Mars once had many moons

    Mars' moons might be the only two left of a larger family of satellites that helped them form in the wake of an asteroid collision.

    By Christopher Crockett
  4. Neuroscience

    Rewarding stimulation boosts immune system

    Activating feel-good nerve cells boosts mice’s immunity, a new study suggests.