On the 21st (local time), this photo was taken at an observatory on the Tibetan Plateau in southwestern China, capturing Saturn on the exact opposite side of the sun. That day, Saturn shone brightly within an oval glow known as gegenschein, or opposition glow. Gegenschein is produced when interplanetary dust distributed along the ecliptic plane of the solar system scatters sunlight, and it appears in Earth's sky at the point directly opposite the sun.
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