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.
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I like the balloon analogy. Draw two dots on a partially inflated balloon and inflate it more. The dots move away from each other. Tape a straw at both ends to the balloon and inflate it again. The straws not going to get longer because it has forces keeping it together.
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