NASA green lights
Else clues• Affirmative responses
• All systems go signals
• Approvals
• Ardent affirmatives
• Astronaut affirmatives
• Astronaut's thumbs-ups
• Astronauts' responses
• Green lights in space, so to speak
• Houston affirmatives
• Informal approvals
• NASA affirmatives
• NASA approvals
• NASA go-aheads
• NASA nods
• NASA responses
• Space-age affirmatives
• Thumbs-up replies
• Thumbs-up responses