"I heard it third-, fourth-, maybe tenth-hand, but it fits in well with the parameters the Polycarbon engineers have set up. A mass of ice and volatiles, well over three klicks across, targeted for the Hellas Depression south of the equator at sixty-five klicks a second, impact expected at UT 20:14:53, 14-4-’54...That’s dawn, local time. Local Martian time, I mean."