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Q&A How can a space "radar" work?

The Question about the blockade of en entire star system makes me wonder: How would, if possible, a space "radar" work? Or how would you scan for Ships further away than your Optical sensors can ...

9 answers  ·  posted 9y ago by Fulli‭  ·  last activity 5y ago by Fulli‭

Question space spaceships ships