Very, very improbable -- the risk to Earth from this comet is much less than the risk from any number of similar objects in unrelated orbits. And the latter ris

Very, very improbable -- the risk to Earth from this comet is much less than the risk from any number of similar objects in unrelated orbits. And the latter risk is very low. The fact that this comet is going to approach Mars doesn't mean it presents any plausible risk to Earth.