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Wikipedia definition
1. Dyson treeA Dyson tree is a hypothetical genetically-engineered plant, (perhaps resembling a tree) capable of growing in a comet, suggested by the physicist Freeman Dyson. He suggested that such plants could produce a breathable atmosphere within hollow spaces in the comet (or even within the plants themselves) utilising solar energy and cometary materials, thus providing self-sustaining habitats for humanity in the outer solar system.
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Read “ダイソン・ツリー” on Japanese Wikipedia
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