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My point is you don't need fancy/expensive materials for your radiator. Anodized aluminum is at 0.8. With inexpensive coatings you can get to 0.9.

If your argument against space datacenters is "radiator materials are too expensive" then I just think that's not a very good argument.

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Oh, sure yeah I agree with that. I was just making a point about the “big hunk of metal” comment. The expense of radiator materials aren’t the problem - the surface area of the radiator is.
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