Related Clues:

• Not possible, futile
• Impossible rhymes
• Such an area is forbidden
• NASA postponement
• "Mission aborted"
• Prohibited or barricaded area
• A small number turn in vain
• Prohibited area
• Futile area
• Barricaded area
• Cancelled, informally
• Scrubbed launch
• Totally off-limits
• Scrubbed, at NASA
• Canceled, as a launch