About the bigger one that doesn't seem to move: I think it does move, it's just that it's so bright (for Hubble) that its brightness overwhelms the slight elong

About the bigger one that doesn't seem to move: I think it does move, it's just that it's so bright (for Hubble) that its brightness overwhelms the slight elongation of its image. In other words, it's (apparently) moving just like the other stars, it's just hard to tell.