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Originally Posted by Avatar28
A bit more serious, wasn't the 2012 asteroid one of the ones they thought at first might hit and then they redid the calculations and found it was going to miss us by a pretty wide margin. I think this was one of the first ones that was hyped up, probably because it was around the time of Deep Impact/Armageddon.
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If I'm not mistaken, the forecast didn't get changed because they redid the calculations, though that's how the media made it sound.
Instead astronomers noticed that they had earlier observations of the same asteroid, so they had a much longer timeline of data to use for the orbital calculations, making the margin of error so narrow that the earth no longer was within the possible path.