calef comments on The Great Filter is early, or AI is hard - Less Wrong
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I also see this claimed often but my best guess also is that this might likely be the hard part. Getting into space is already hard. Fusion could be technologically impossible (or not energy positive).
Fusion is technologically possible (c.f., the sun). It just might not be technologically easy.
The sun is not technology (=tools, machinery, modifications, arrangements and procedures)