So here's the deal, I've done all of my long exposure and Star Trail photography using my DSLR. Point it at the sky, set it to a 30 second exposure, put it in time lapse mode and let it do it's thing for an hour or so. I picked up a GoPro Hero 7 a while back and ya, I use it for pretty much everything it's capable of doing, from filming cool action sports videos, to hyperlapse, time lapse, night lapse, etc, but I've never used it for Star Trail photography. It never dawned on me that I could use it for the same thing I'm using my DSLR for. I mean, it's fully capable; it shoots long exposure, it shoots in RAW, I can adjust the ISO, I can adjust the interval in between shots. All using the Night Lapse mode. I just never put the 2 and 2 together and realized that I could do the same thing I use my DSLR for. Duh.
Now that I know these things, I'm definitely taking it with me when I head out to shoot some more star trail photography and see what I can come up with and how it compares to my DSLR. Either way, it shoots in a much wider field of view compared to my widest angle lens I have for my DSLR, so it should be kinda cool.
Speaking of cool, here's a cool video from What Alex Did that goes over settings and whatnot to achieve a cool Star Trail image using your GoPro Hero 7 Black.