Answer: PROBE

AnswerCrossword Clue
PROBEInvestigate thoroughly
PROBESee circled letters
PROBECertain NASA launch
PROBEGovernment investigation
PROBEExploratory spacecraft
PROBESpace explorer
PROBEGrand jury's activity
PROBEDeep-space mission
PROBEPerscrutation
PROBEExploratory device
PROBESearch extensively
PROBEExplore
PROBETest
PROBELunar ...
PROBESearch thoroughly
PROBESurgical instrument
PROBESearch
PROBESearch into
PROBEInquiry.
PROBEExploratory machine
probeinvestigation
probeto examine thoroughly
probeinstrument for exploring a wound
probeto examine thoroughly
PROBENonhuman explorer
PROBEDig for answers
PROBEDo some digging
PROBEReally dig
PROBEInvestigate.
PROBENASA vehicle
PROBEExploratory expedition
PROBEVoyager or Pathfinder, e.g.
PROBEQuestion closely
PROBEInvestigate completely
PROBEInvestigation with much digging
PROBEExamine
PROBEDoctor's examination or instrument
PROBEPoke into
PROBELook into
PROBEDelve