timtyler comments on Ben Goertzel: The Singularity Institute's Scary Idea (and Why I Don't Buy It) - Less Wrong
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I don't think you could see any of those things very easily in other galaxies if they were there. What you can see in other galaxies is chemical compounds - through mass spectroscopy. That shows some of them are rich in "life-like" stuff. Also, there is no shortage of darkish matter out there.