Single 3 minute frame of the Ring nebula (M57) in Lyra. This is a shell of gas expelled by a dying star. In the cropped version the remains of that star, a white dwarf, can be seen at the center of the ring.

@numericcitizen yeah it is some satellite. Mostly a starlink as there are 3000+ starlinks (~50% of all satellites) in orbit. These days every image I take satellite trails. Thankfully the post processing removes them.