Impact

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Factual error: The Moon is struck by a "brown dwarf fragment" having twice the mass of the Earth, which isn't noticed by anyone on Earth until a few minutes before impact. But an object of this mass would have profound effects on Earth's tides; its effects would have been equal to those of the Moon from the time that the object was within 2 million km of the Earth, over five times the Earth-Moon distance. (At astronomical speeds, this would provide nearly a full day's warning.) Such anomalies would not have gone unreported; they would be of universal interest to the scientific community. And because the planet's tides are highly predictable and heavily monitored, anomalies worthy of scientific examination would have occurred when the object was further still.

DavidK93

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