Related Clues:

• High-flying letters
• Letters on Endeavour
• World Wind developer
• Rover's watcher
• 'The Right Stuff' subj.
• Agcy. known to shoot for the stars
• Space-exploring gp.
• Jet Propulsion Lab grp.
• Houston org.
• ET-seeking org.
• Certain IAA group focus
• Stargazing org.
• Atlantis launcher
• Shuttle operator
• Pioneer's org.