That's the best case. You can't get a lower impact velocity than you get by starting out at a relative halt, and anything falling in from solar orbit...
They've never publicly released anything more than the name and general idea of a larger successor. I don't see how they could be "not serious" about...
They started a clock when they started stacking the SRB segments, since they're only rated to remain stacked for a year. A delay means either waiving...
Those earthquakes are huge, but not large enough to explain the change in earth's rotation. But, the rotation has changed a lot, that's the activity...
As I said, rarely. One example is the throttle valves for the Merlin 1D, they added dithering (intentional variation in position) to address stiction...
It was done under the consultation of actual rescue divers. I'll take their opinion of what's a good idea over yours or some random cave diver hired...