Related Clues:

• Its work is done in stages
• Pathfinder's parent
• 'The X-Files' org.
• Atlantis owner
• Org. with missions
• Astronaut's insignia
• Endeavour acronym
• Atlantis letters
• Shuttle group
• Schirra's group
• Space explorer
• Father of Ramses II
• Shuttle org.
• Org. with a mission
• Canaveral letters