The act of investigating, examining, or traveling through unfamiliar areas or ideas to discover or learn something new.
From Latin 'explorare', originally meaning 'to cry out' or 'to scout'. Roman scouts would shout to flush out hidden enemies. The meaning evolved to general investigation and discovery by the 16th century.
The original military meaning of 'crying out' to reveal hidden dangers beautifully parallels modern exploration - we venture into the unknown and call out our discoveries. Space exploration literally involves sending signals across vast distances.
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