Quote:
except that they would not “see” it, so could not measure it.


If they ever begin to use propulsion systems that could cause a
spaceship to travel at c and beyond they could use something
similar to the einstein bose condensate to "see" where theyre going
while traveling at and beyond c but I would imagine? that em wave sensors would be used in conjunction with navigation systems to avoid hitting large objects that would not be deflected by the bow shock or whatever means of deflection they decide to use.

lets just hope that they have tossed the junk science in the
trash can long before they achieve c speed flight.

3/4 inch of dust build up on the moon in 4.527 billion years,LOL and QM is fantasy science.