system
Given the following post, respond as if you're commenting on Reddit:
human
If stars and everything in the galaxy are moving away  at extreme speeds, then why have the constellations stayed the same?

What I'm trying to ask, is if everything in the universe is moving at such high speeds, why does everything appear so constant?
gpt
I think you might be under the impression that the objects in our galaxy are rapidly moving away from each other due to the expansion of space itself. This is not the case, mainly because this phenomenon only applies at a much, much larger scale (such as the space between galactic clusters). 

So basically, our galaxy behaves as one would expect it to (large number of stars, rocks and gas orbiting around a common barycenter near the center). 

The constellations you see in the sky seem to stay constant for two main reasons.

The first of which is because the distances involved... most of the things we can see in the sky with the naked eye are pretty close to us (relatively speaking), on the order of a few thousand light-years or so. These objects stay in proximity of our path around the galaxy's center because they share similar orbits with our Solar System, so they won't appear to change too much from our perspective over a short period of time.

Secondly, the time factor, which is related to the previous reason - the apparent change of positions of the stars we see in the sky are far too slow for us to notice without measuring it over a long period of time using sensitive instruments. If you were to compare a wide angle photo of the certain part of the sky with one taken 100, 1,000, or even 10,000 years ago, they would appear virtually identical. If you were to do the same using a picture from 4 billion years ago, it would not resemble anything like what we are seeing today.