Pillow nebula reveals new patterns and mysteries in celestial observations

NGC 7027 is a small planetary nebula known as the "pillow nebula" due to its pillow-like shape. It is located about 3,000 light-years from Earth (1 light-year is the distance light travels in one year, approximately 9.46 trillion kilometers) and has been emitting gas into its surroundings for a long time, forming a blue shell shape. The cause is unknown, but recently it has been emitting brown gas and dust in specific directions, forming a new pattern with four corners. There is a hypothesis that there is a close binary system at the center, where one star sends gas into an irregular disk orbiting another star, but the exact structure remains a mystery. NGC 7027 can be observed with a typical household telescope in the direction of the Cygnus constellation.