An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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keyhole
  سوراخ ِ کلید  
surâx-e kelid (#)
Fr.: trou de serrure  

  1. The hole in which a key of a lock is inserted.

  2. → Keyhole Nebula.

  3. A small, about 600 m wide, region of space close to the Earth where the Earth’s gravity would perturb the trajectory of a passing → Near-Earth Object. The object will receive a gravitational push that will bring it back for a collision in the future. Also called resonance keyhole.

See also: → key; → hole.