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An asteroid is generally considered dangerous if it is larger than 140 meters (about 460 feet) in diameter, as this size has the potential to cause significant regional or global damage upon impact. Smaller asteroids can still be hazardous, but those above this threshold are classified as Near-Earth Objects (NEOs) and are closely monitored. The potential for widespread destruction increases with size, particularly for asteroids over 1 kilometer (about 0.6 miles), which could have catastrophic effects on a global scale.

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2mo ago

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