What does it take to become an "ace"?
And has anyone ever been stripped of that status?
What determines an airplane’s lifespan?
Some keep flying for decades, while others end up on the scrap heap.
How did the Apollo astronauts toss their spacesuits overboard?
Hint: They kept the most important part.
How does the International Space Station dodge space junk?
The 200-ton orbiting behemoth can get out of harm's way, but not very quickly.
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