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Can someone explain what this is/was?

While visualizations like stuffin.space are fun to look at, I think they add to the perception problem. The GP's comment was that space is huge compared to the number of human-made satellites. This cannot be refuted by pointing to a visualization that at the default zoom level represents small communications satellites to be the size of Rhode Island.

Agreed that is a significant gating factor, but the situation is not impossible. Several paths are laid out for moving forward in a 2018 report by a couple of ANL scientists. The report is quite readable, even if you know little about materials science.

[1] https://art.inl.gov/ART%20Document%20Library/High%20Temperat...