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GettyIt’s not really a question of whether a massive asteroid—one big enough to wipe out human civilization—will fall into a collision course with Earth. It’s a question of when.NASA estimates a 1,000-foot-wide asteroid, big enough to flatten a city, hits our planet every 70,000 years or so. Half-mile-wide rocks, capable of killing much of the life on Earth, strike every 700,000 years.Anticipating the inevitability of a catastrophic impact, scientists are scrambling to devise methods of detectin