Hale-Bopp, e.g.

I believe the answer is:

comet

(Other definitions for comet that I've seen before include "Tailed space traveller" , "astronomical sight" , "bright star" , "Small orbiting body in the solar system" , "Celestial object" .)

I've seen this clue in the L.A. Times Daily, The Washington Post and the USA Today.

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