Close encounters of the rocky kind are a real threat to our planet. Since 1998, scientists continue to scan the globe with ground and space telescopes looking for killer space rocks a
half-mile or bigger. To date, they are confident they have found 95 percent of potential planet- killing asteroids. None of which are headed for Earth. This is definitely good news.
In the same breath, less than 1 percent of city-killing space rocks have been detected. This means millions of potentially dangerous, even unknown impact threats still exist and could
be on a collision course with Earth.

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