The seriousness of the impact cannot be overstated.
Estimates of velocity (>50km/sec) and size (> 50km diameter) along with the tenuous nature of Mar's atmosphere mean the inner solar system will likely be unfit for safe space travel for a very long time (in human reckoning).
The ejecta will spread far and wide, and there will be big lumps in it. The earth orbit debris caused by one Chinese satellite collision will be absolutely nothing compared to the mess C/2013 A1 will cause if it hits Mars.
I really hope that it does not impact. But if it does, our troubles have just begun.
Regards,
Tony Barry
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