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Q&A How big an object should I build on Earth so that it is visible from space?

I want to build a big structure that will be visible from space. A object would need to be very large, maybe kilometers across, to be visible from, let's say, the ISS (which orbits at an average he...

1 answer  ·  posted 8y ago by RudolfJelin‭  ·  last activity 8y ago by RudolfJelin‭

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