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Starfleet Veteran
Join Date: Jun 2012
Posts: 2,734
# 9
02-28-2013, 02:01 PM
If it's at the lowest range of its size, chances are already slim that any of the probes would survive, no matter where the impact is - that's 1.5-2x the size of the Chicxulub impactor on smaller planet with a thin atmosphere, it will be a global event.

If it's towards the upper range of size, though, the rovers are lost, period, no matter where they are. There's even concern that some of the orbiting probes will be in danger, since some of them are as low as 300-400 km. A 50 km impactor would create a crater larger than most known on any body in the inner solar system. The impact on Mars would be unbelievable.