The words hamsena yanena are very significant here. Hamsa-yana, the airplane by which Brahma travels all over outer space, resembles a swan. Brahma is also known as Hamsa because he can grasp the essence of everything. His abode is called tri-dhama-paramam. There are three divisions of the universethe upper planetary system, the middle planetary system and the lower planetary systembut his abode is above even Siddhaloka, the upper planetary system. He returned to his own planet with the four Kumaras and Narada because they were not going to be married. The other rsis who came with him, such as Marici and Atri, remained there because they were to be married to the daughters of Kardama, but his other sons Sanat, Sanaka, Sanandana, Sanatana and Naradawent back with him in his swan-shaped airplane. The four Kumaras and Narada are naisthika-brahmacaris. Naisthika-brahmacari refers to one who never wastes his semen at any time. They were not to attend the marriage ceremony of their other brothers, Marici and the other sages, and therefore they went back with their father, Hamsa.