Answer: ogo

AnswerCrossword Clue
OGO

Observatory in the skies.

OGO

"Observatory" satellite.

OGO

U.S. satellite.

OGO
Space initials
OGO
Sky observatory: Abbr.
OGOU.S. satellite
OGORelative of Explorer
OGOU.S. space observatory
OGOU.S. scientific satellite of the 60's
OGOU.S. satellite of the '60s