Ka taea te whakatau i te tawhiti ki te nebula planetary tata mā te ine i to ratou auau whakawhānui. Ka taea e ngā kitenga taumira tiketike tangohia e rave rahi tau atu ka whakaatu i te whakawhānui o te nebula perpendicular ki te raina o te tirohanga, i te kitenga spectroscopic o te nekehanga Doppler ka whakaatu i te tere o te whakawhānui i roto i te raina o te tirohanga. Whakataurite i te whakawhānui koki ki te tere i ahu mai o te whakawhānui ka whakaatu i te tawhiti ki te nebula. Ko te take o te pehea i taea te whakaputa i taua whānuitanga rerekē o ngā āhua nebula he debatable. Ko te reira i te pānga i waenganui i te rauemi neke atu i te whetu i ngā āhuatanga rerekē ka arahi ki te nuinga kitehia. Heoi, etahi astronomers whakaaro e taea e ngā whetu tata te kawenga mō te whanui o te nebula pokapū me te nui rawa o ngā āhuatanga o te nekehanga i roto i te nekehanga o te nekehanga. Heoi, i te maha o ngā tikanga kua kitea i runga i te pāmahana nui rawa
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