aoks Thumbs-up answers NASA go-aheads NASA affirmatives High "Si!"s? Astronauts' responses Space-age affirmatives Nods from NASA NASA thumbs-ups NASA responses Launchpad thumbs-ups Astronaut's thumbs-ups Astronaut affirmatives NASA green lights "Thumbs-up" responses "All systems go" signals Informal approvals NASA approvals Thumbs-up responses Breezy assents Positive signs of life in outer space? Astronauts' "All's-well" calls NASA nods Affirmative responses Astronauts' affirmatives