
Asteroids represent ancient, rocky remnants of the early solar system, occasionally drifting from the belt between Mars and Jupiter into Earth's proximity. NASA actively tracks these near-Earth objects, categorizing those that pose potential collision risks. While smaller impacts can cause localized devastation, massive objects exceeding 60 miles in diameter could trigger global extinction events, similar to the Chicxulub impactor that ended the Cretaceous period. Modern planetary defense strategies prioritize non-destructive deflection over fragmentation. Techniques such as kinetic impactors, demonstrated by the DART mission’s ability to alter an asteroid's orbit, and gravitational tractors offer viable methods to nudge hazardous bodies off-course. These proactive measures, combined with long-term monitoring, provide humanity with the capability to mitigate existential risks from space-borne threats, shifting the focus from passive observation to active planetary protection.
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