A quick visit or casual encounter with someone or something, or an astronomical term for when a spacecraft passes near an object.
From 'fly' + 'by', modern 20th-century term. Originally used in aerospace for spacecraft trajectories, later used colloquially for casual meetings.
NASA changed exploration forever with flybys—instead of landing probes everywhere, spacecraft could whiz past planets gathering data, like cosmic tourists snapping photos from a fast train.
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