Just look up "silicosis" to see what the astronauts would be up against. The ultra-fine dust would be extremely sharp-edged due to lack of weathering, and would embed deeply in lung tissues. Not a good thing.

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The ether of general relativity therefore differs from that of classical mechanics or the special theory of relativity respectively, in so far as it is not 'absolute', but is determined in its locally variable properties by ponderable matter.

Albert Einstein, "On the Ether", 1924