If you have ever looked up at the sky and seen a star cluster about the size of a full moon, it is likely the "Pleiades cluster (M45)." This group of stars, one of the most famous star clusters in the sky, is so bright that it stands out even in places with severe light pollution like cities. The nebula surrounding it, made of gas and dust, can be seen in the dark sky even with the naked eye.
Using a telescope allows for capturing much more. The blue stars of Pleiades, also known as the "Seven Sisters," brightly illuminate the surrounding cosmic dust, creating a blue nebula. The blue nebula can only be seen with long-exposure photography. There also appears cosmic dust that stretches upward like arms. This entire structure is surrounded by a red hue originating from hydrogen, the most abundant element in the universe. This image was taken last year at the Star Front Observatory in Texas, USA.