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- ...at is not well understood- 2013-04-9 14-29.jpg|thumbnail|The sun is an MHD system that is not well understood.]] ...al |last=Alfvén |first=H. |year=1942 |title=On the cosmogony of the solar system III |journal=Stockholms Observatoriums Annaler |volume=14 |pages=9.1–9.2939 KB (5,446 words) - 08:08, 10 May 2021