The first Omega 47 mine in #StarfleetAcademy's "300th Night"⬆️ is dropped in an empty region of space between Delta IV (homeworld of the Deltans ↙️) and Miri's homeworld ⬇️. Comet 493-30923 is the comet from "Balance of Terror"↘️ (identified in #StarTrekSNW's "A Quality of Mercy").