NASA is developing methods to detect smaller asteroids like the one that exploded over central Russia last week. So far, the near-Earth object project has detected nearly 95% of asteroids wider than a kilometer within the planet's vicinity. But smaller asteroids are more difficult to find because of their size. The $5 million Asteroid Terrestrial-Impact Alert System is designed to detect small objects in space and give enough warning to evacuate people and protect infrastructure.
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