Isithombe sibonisa umkhumbi omkhulu onezinsika ezintathu ohamba olwandle olukhulu, oluluhlaza okwesibhakabhaka ngaphansi kwesibhakabhaka sasebusuku esigcwele izinkanyezi. Imikhumbi iyahamba emoyeni, kanti isikebhe semikhumbi sinombala onsundu omnyama. Umkhumbi uya ngakwesokunene sesithombe, ushiya ngemuva umzila wegwebu elimhlophe phezu kwamanzi. Umkhumbi uzungezwe ukuboniswa okugqamile kwemibala, okuhlanganisa imibala epinki, onsomi, neluhlaza okwesibhakabhaka, ebonakala sengathi ivela ku-nebula ngemuva. I-nebula iyifu elikhulu, elinemibala yegesi nothuli, elinendawo ephakathi eluhlaza okwesibhakabhaka ekhanyayo nombala opinki-orenji. I-nebula itholakala ekhoneni eliphezulu kwesokudla lesithombe, okwenza umehluko omkhulu nomkhumbi nolwandle.