Appeared like comet, then the long string of 25-30 lights silently glided directly over head. Disappeared, travelled 50 miles in 1 min

While watching movie at drive in (sitting outdoors in truck bed) we thought we saw a comet in a north direction, but it was moving upwards. As it moved upwards 25-30 small, bright white lights spaced themselves out with an equal, short distance between them. We listened for sound but only heard a plane moving away from the lights. Lights glided low, directly overhead, slowly (about 5 mph) and silently. Leading craft (in front of the lights) was an indistinguishable shape, even at that close proximity. We watched the lights disappear 30mi to the south with no turning, no cloud cover, just gone. There was no drone hum sound or any sound of any kind. It may have been one object with several lights, which would’ve been a very long cigar shape if so; or several small ones in formation. We could see nothing around or between lights except for the head/lead craft that seemed to change shape. There were some dogs at the drive in which were all barking while the lights flew overhead. My phone camera/video wouldn’t show the lights even when directly overhead, but my sister in law got one blurry photo while they were directly behind her vehicle (attached).
Starlink satellites