potentially hazardous object

/P AH0 T EH1 N SH AH0 L IY0 AE0 Z ER0 D AH0 S AA0 B JH EH0 K T/
noun
  1. 1

    (astronomy) A near-Earth asteroid or comet with an orbit such that it has the potential to make close approaches to the Earth and is of a size large enough to cause significant regional damage in the event of impact.

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