It’s my understanding that in astronomical distances, things can be moving further apart by the space between them expanding, *not* simply by motion.
For example, say you have star A, 1 million light years from star B, both completely motionless for argument. These stars have a relative motion because the space between them expands, correct? So 1 million light years becomes 1,000,007 light years after 1 year of time.
If all that is true, does this affect smaller scale measurements? Does a mile of road technically become 1.000007 miles? Please let me know what I’m not understanding.