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A logical next question might be, why do the three stars have camera spikes while the much more distant galaxies do not? I'm no expert, but I presume the answer lies in the photographic method. In order to capture the few photons reaching us from the very faintest galaxies (the faint pinpricks of light you see in-between all the obvious large galaxies), astronomers trained the Hubble Space Telescope on this patch of sky and left the lens open for ten days. The objects at galactic range would show no apparent movement at all, but nearby stars might--all the Milky Way stars, including our sun, are rotating around the galactic center. So, my uninformed guess is that those camera spikes are registering slight star movement.