The DART mission proved we can alter an asteroid's path, but it was a small moonlet, and changing a true planet-killer remains uncertain. The NEO catalogue offers decades of warning for larger bodies, yet the smaller, more frequent city-killers can still arrive with little notice. My confidence comes from calibrating sensors—here in Bengaluru, we chase the faintest signals against the noise, knowing a single pixel's shift in the data is the difference between a near-miss and a direct hit.
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