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For questions that require plausible (better than suspension-of-disbelief) answers based on Real World science that are not necessarily constrained to the known limits of Real World science. Contrast with the hard-science, science-fiction and internal-consistency tags. This tag may not be used alone. This tag may not be used with the science-fiction, hard-science, or internal-consistency tags.

16 votes

How to create a "fog of war" on an interstellar scale?

A literal "fog" of war. There could be very numerous gas particles that exist everywhere, dispersing light, and generally making looking far hard. That's what a nebula is. Some block more light than …
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