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Mnementh said:
SvennoJ said:
I guess they are see through, or will these (probably rather large balloons) cast shadows?

These things coming down every 100 days, that's not much of a permanent solution.

Looks quite transparent. But this high up I doubt it is relevant even if not transparent, the shadow will be obscured by scattered light over distance.

Looks quite big too. You wouldn't want that landing in a crowded outdoor swimming pool or lake with people in it!
I guess they'll figure out a safe way to land these things.