Dutch astronomer Christiaan Huygens published his work Systema Saturnium in 1659, in which he proposed that Saturn's apparent 'ears' were actually a ring of material encircling the planet.
Sources
- Saturn facts (skyatnightmagazine.com)
- https://mathshistory.st-andrews.ac.uk/Extras/Huygens_Saturn/ (mathshistory.st-andrews.ac.uk)
- https://library.si.edu/digital-library/book/cristianihugeni00huyga-0 (library.si.edu)
- https://www.loc.gov/item/2021666744 (loc.gov)
- https://time.com/archive/6698524/space-ears-rings-and-cassinis-gap/ (time.com)
- https://galileo.ou.edu/exhibits/system-saturn.html (galileo.ou.edu)
- https://www.esa.int/Science_Exploration/Space_Science/Cassini-Huygens/Saturn_s_rings (esa.int)
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