If the universe is so huge, wouldn it take, maybe, a million years before wed see a 1 mm difference in position of a star as seen through a telescope?
It depends on the distance to the star. For very nearby stars, with good telescopes it actually is possible to see stellar positions change – more on this later. As for motions of very distant objects: we can’t usually detect these directly, but we can determine their velocities by wavelength shift of their light- more on this later, too.
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