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See my reply elsethread --- a truck sized enclosure isn't reasonable for life support and so forth.

• sandworm101 3y ago
  >> truck sized enclosure isn't reasonable for life support and so forth. Who said anything about life? A machine-intelligence could operate a tiny craft. And even a biological, think brain in a jar, doesn't need that much space. Astronomers cannot find or disprove the existence of Planet X in the ort cloud, an object at least several times the size of earth. An entire civilization could be out there and we wouldn't notice.
• bitcharmer 3y ago
  Not a strong believer in LGM but I don't like your statement for two reasons: 1) life may take different forms, some of which we probably haven't even dreamt about 2) life is not necessary for inter-stellar probes to exist. In fact it probably makes more sense to make these things entirely artificial