Okay, I&#x27;m curious now.<p>Why is isolating an entire star system particularly difficult? How about &quot;here be dragons&quot; on a map? It&#x27;s not like a fence is required; the area simply has to be avoided.<p>While I appreciate that this requires ensuring everyone uses the same map, is it unreasonable to suppose there is only one map? A self-propagating peer-to-peer map, something akin to DNS perhaps. By the time you&#x27;re near a danger zone, your map is updated with all relevant information. Similarly, you update the local map nodes with information about the region you&#x27;ve traveled through. A pan-galactic openstreetmap.<p>Beyond human capability, sure, but we are talking about interstellar aliens.<p>And FTL travel? How about near light speed instead?