Related Clues:

• Fine, in space
• Worth a 10, maybe
• Verbal thumbs-up
• Lined with Kevlar
• A 10, by some standards
• "Everything's fine!"
• Often unattainable perfection
• Best-possible
• Without a flaw
• NASA's "Go"
• Spoken thumbs-up
• Like a 300 game in bowling
• NASA fine?
• Worth imitating
• The American dream, e.g.