Is there a formula that tells us how fast space is expanding? For example, assume we determine via several measurements that a star is 1000 ly away. Does this distance take into account that space is expanding for the years that the light has taken to reach us? And is the star currently 1000 ly away or is it something different now? I'm visualizing a thought experiment where I want to plot a course to that star travelling very close to c. I realize that the earth, the star and my space ship are all moving relative to one another. To plot this hypothetical course, would I need to factor in the expansion of space too?