Related Clues:

• Exploratory spacecraft
• Nose around
• Inquiry
• Examine thoroughly
• Look into
• Part of an alien abduction story, often
• Voyager 2, for one
• Question closely
• Data-collecting craft
• Delve
• Official investigation
• Senate investigation
• Penetrating investigation
• Explore deeply
• Voyager or Pathfinder, e.g.