A failed Soviet Venus probe from the ’70s crashed to Earth in May — why was it so hard to track?

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The recent fall to Earth of a failed Soviet Venus probe from the 1970s has become a detective story of sorts.

Different computer models were used to predict the reentry. But why were they divergent, and how can we improve our ability to nail down the “whereabouts and when” as a space object crashes into Earth’s atmosphere?



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