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disk of planetesimals and dust found around many main sequence stars, paljude peajada tähtede ümber leiduv planetesimaalidest ja tolmust koosnev ketas
purdketas . Kosmoseteaduse ja -tehnoloogia terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//kth/purdketas/1/est (20.06.2026)
