LL Pegasi
This image is a composite of images made with the NASA/ESA Hubble Space Telescope and the Atacama Large Millimeter/submillimeter Array (ALMA), both observing the binary star system LL Pegasi. The old star LL Pegasi is continuously losing gaseous material as it evolves into a planetary nebula, and the distinct spiral shape is the imprint made by the stars orbiting in this gas.
Image Credit: ALMA (ESO/NAOJ/NRAO)/H. Kim et al., ESA/NASA & R. Sahai
Explanation from: https://www.eso.org/public/images/potw1710b/
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