I plopped a star base next to a wonderful black hole with 3 antimatter. I was tickled when the base started mining all 3. Several turns later the scout came back on the other side and found a second black hole where if I placed the star base just right I could hit 4. I destroyed the star base and a bit later built the new one. When it started mining and you could see paths to the antimatter. I noticed the old paths were still there. 50+ turns later when doing some updates to the star base, the old lines are still there.