Just an obscure little cloud of hydrogen.
This nebula goes by the unassuming name of SH2-9. It’s part of a larger complex of clouds known as the Rho Ophiuchi complex, but you don’t often see people focusing on this part of it. It’s a challenge to image from my location, as it’s very low in the sky in a light-polluted direction. There is some blue behind that bright star (Sigma Scorpii) that I just wasn’t able to pull out from the light pollution. But that star is ionizing those huge clouds of hydrogen gas, which almost look like terrestrial clouds in this image.
