Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Passage: Nisa zuwa planetary nebulae gabaɗaya ba a ƙayyade su da kyau. Zai yiwu a ƙayyade nisa zuwa mafi kusa da duniyar duniyar ta hanyar auna ma'aunin fadada su. Binciken da aka yi a cikin shekaru da yawa zai nuna fadada nebula a tsaye zuwa layin gani, yayin da kallon kallon Doppler zai bayyana saurin fadadawa a cikin layin gani. Kwatanta fadada kusurwa tare da saurin fadada fadada zai bayyana nisan zuwa nebula. Batun yadda za'a iya samar da irin wannan nau'ikan nau'ikan nau'ikan nebula shine batun da za'a iya muhawara. An yi ka'idar cewa hulɗar da ke tsakanin kayan da ke motsawa daga tauraron a hanyoyi daban-daban yana haifar da mafi yawan siffofin da aka lura. Koyaya, wasu masana taurari sun yi iƙirarin cewa taurari biyu na tsakiya na kusa na iya zama alhakin mafi rikitarwa da matsanancin duniyar taurari. An nuna da yawa don nuna filin magnetic mai ƙarfi, kuma hulɗarsu da iskar gas na iya bayyana wasu siffofin nebulae na duniya. Akwai manyan hanyoyi guda biyu don ƙayyade yawan ƙarfe a cikin nebulae. Waɗannan sun dogara ne akan layin sake haɗuwa da layin da aka tayar da haɗuwa. Ana ganin manyan bambance-bambance a wasu lokuta tsakanin sakamakon da aka samu daga hanyoyin biyu. Ana iya bayyana wannan ta wurin kasancewar ƙananan canjin yanayin zafi a cikin nebulae na duniya. Bambance-bambance na iya zama babba don haifar da tasirin zafin jiki, kuma wasu suna tunanin wanzuwar ƙuƙwalwar sanyi mai ƙarancin hydrogen don bayyana abubuwan lura. Koyaya, har yanzu ba a lura da irin waɗannan ƙuƙwalwa ba.  Tambaya: Ƙungiyoyin sanyi suna ƙunshe da ƙarancin wane abu?
hydrogen