Crossword Genius

Exploratory spacecrafts (6)

Ross

I believe the answer is:

probes

(Other definitions for probes that I've seen before include "Examines carefully as dentist does a bad tooth" , "Examines in depth as dentist does tooth" , "Questions or examines thoroughly" , "Investigates closely" , "Examines as dentist does decaying tooth" .)

I've seen this clue in the USA Today.
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