Planeetide kaaslased ja rõngad
wikipedia.org/wiki/Deimos
http://fyysika.onepagefree.com/files/Teema%204%20-%20P%C3%A4ikeses
%C3%BCsteemi%20kaaslased%20ja%20v%C3%A4ikekehad.pdf
http://et.wikipedia.org/wiki/Kuu
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