This star trail image has something very unique. If you look closely, one of the arcs is green and doesn't quite follow a perfect circle like the others arcs. That's because the green line is comet C/2022 E3 (ZTF), the so-called "green comet" that is in a long orbit and won't return in our lifetime. It follows a different path than the apparent movement of stars (based on earth's rotation) and therefore stands out in the circles.