Answer:

probes

Answer	Crossword Clue
PROBES	Space vehicles
PROBES	Exploratory spacecraft
PROBES	Lunar explorations

PROBES	Investigations
PROBES	Examines closely
PROBES	Looks into
PROBES	Investigates
PROBES	Space explorers
PROBES	Pokes around
PROBES	Deep-space vehicles
PROBES	Congressional specialties.

PROBES	Inquiries into corruption.
PROBES	Investigates.
PROBES	Investigations.
PROBES	Investigates thoroughly.
PROBES	Explores
PROBES	Congressional investigations
PROBES	Inquiries
PROBES	Galileo and Magellan

PROBES	Some space missions
PROBES	The Mariners, e.g.
PROBES	Examines