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«Jupiter's Great Red Spot: A Swirling Mystery». NASA. 4. august 2015. «Goddard scientists Mark Loeffler and Reggie Hudson have been performing laboratory studies to investigate whether cosmic rays, one type of radiation that strikes Jupiter's clouds, can chemically alter ammonium hydrosulfide to produce new compounds that could explain the spot's color.»
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Phillips, Tony (12. mars 2003). «The Great Dark Spot». Science at NASA. Arkivert fra originalenBruk av |arkiv_url= krever at |arkivdato= også er angitt (hjelp). Besøkt 20. juni 2007.
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