The planetary nebula is SDSO1. It shines blue next to the Andromeda Galaxy. A planetary nebula consists of gas and dust emitted by a white dwarf, which is the final stage of a star's evolution. The Andromeda Galaxy is located about 2.5 million light-years away from Earth (1 light-year is the distance light travels in one year, approximately 9.46 trillion kilometers).
SDSO1 is a planetary nebula located in our galaxy. The Andromeda Galaxy is the largest galaxy in our galaxy. SDSO1 was discovered by amateur astronomers in 2022. The blue light indicates the emission of oxygen.
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