I thought of something else concerning the hibernation of the Invincible's crew during its trips through space.
As I said above, even while hibernating (sleeping?), they still must ingest food and water.
Therefore, they must also defecate and urinate.
And, I think without a constant flow of water through them, a person's kidneys will fail.
I guess the details of reality are not so romantic or easy to write about, especially in a fictional story, but, they still exist.
I think the same would apply to Lem skipping over how, the very simple, as I think he described them, flies, reproduce.
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