Doona was a star located in the galaxy's Alpha or Beta Quadrants, in or near the Alpho Galaxy region of space. When it became a supernova, a piece of it somehow escaped destruction. It weighed ten thousand tons, was ten times harder than diamond, and radiated a repelling force. Vulcan scientists studied the phenomenon for centuries.

In 2266, the USS Enterprise used magnetic force to tow the former star to the point where the planets Morti and Inicrust were about to collide, the repelling force preventing the destruction of both worlds and their inhabitants. (TOS comic: "When Planets Collide")

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Alpha and Beta Quadrant stars and star systems (D)
DaffodonDagemDak-AlphaDantarDanulaDaranDarosDaxuraDD TauriDelanosDelosDelta (Delta Principius/Delta Triciatu)Delta ArietisDelta ArlanaDelta CassiopeiaeDelta DariusDelta FuegoDelta IndusDelta NeezottDelta Principius/Delta TriciatuDelta VegaDemeterDeneb KaitosDenkirDenocetDenroDetriaDevidianDevonaDextera 273Dhum'QhaDhu'QuaDidactiDigifalDilyutDinarDizokDonovan's StarDoonaDoralaDouruineDragoDrakenDramiaDraxis IIDrexler Alpha and Beta Quadrant icon image.
Alpha Quadrant stars and systems (D) DavonDelaviDelkarDelta AquilaeDelta AurigaeDelta HerculisDelta Pegasi (Delta Pegasi ADelta Pegasi B) • Delta Ursae MajorisDenabDenebDeneb el OkabDeneb KaitosDenobula TriaxaDnocesDoltecDopteriaDorvanDraco MinoraDraco Omega 371Draco UrsulaDraygoDraylonDreonDubhe Alpha Quadrant icon image.
Beta Quadrant stars and systems (D) D'deridexDa'KelDasha VertaDavlosDayosDelta CanarisDelta CorviDelta DoradoDelta EridaniDelta GammaDelta GeminorumDelta HydriDelta LeonisDelta LeporisDelta OrcusDelta PavonisDelta PhoenicisDelta RanaDelta VelorumDenevaDerexDesotrianaDevolinDevorasDevorrenDevronDewaDinasiaD'KorinDonatuDrovnaDumok'azen Beta Quadrant icon image.
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