Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Passage: 90377 Sedna babban ƙaramin duniya ne a cikin sassan waje na Tsarin Rana wanda ya kasance, a cikin 2015, a nesa da kusan 86 astronomical raka'a (1.29 × 1010 km; 8.0 × 109 mi) daga Rana, kusan sau uku kamar Neptune. Spectroscopy ya bayyana cewa Sedna ta surface abun da ke ciki shi ne kama da wadanda na wasu sauran trans-Neptunian abubuwa, kasancewa da yawa a cakuda ruwa, methane, da kuma nitrogen kankara da tholins. Fuskarsa tana daya daga cikin ja a tsakanin abubuwan Tsarin Rana. Wataƙila duniyar dwarf ce. Daga cikin manyan abubuwa takwas na trans-Neptunian, Sedna shine kawai wanda ba a san yana da wata ba. Ga mafi yawan zagayensa, har ma ya fi nisa daga Rana fiye da yanzu, tare da aphelion da aka kiyasta a 937 AU (sau 31 nesa da Neptune), yana mai da shi ɗayan mafi nisa-abubuwan da aka sani a cikin Tsarin Rana ban da dogon lokaci.Sedna yana da tsayi mai tsayi da tsayi, yana ɗaukar kimanin shekaru 11,400 don kammalawa kuma yana da nisa mafi kusanci da Rana a 76 AU. Waɗannan abubuwan sun sa mutane da yawa sun yi hasashe game da asalinsa. Cibiyar Ƙananan Planet a halin yanzu tana sanya Sedna a cikin faifan da aka warwatsa, ƙungiyar abubuwa da aka aika zuwa cikin tsayi mai tsayi ta hanyar tasirin nauyi na Neptune. An kalubalanci wannan rarrabuwa saboda Sedna bai taɓa kusantar da Neptune ba don ya watsar da shi, wanda ya sa wasu masanan taurari suka yi magana da shi ba da izini ba a matsayin memba na farko na girgije na Oort na ciki. Wasu kuma suna hasashen cewa wataƙila wata tauraro da ke wucewa ta jawo shi zuwa inda yake a yanzu, wataƙila ɗaya a cikin tarin haihuwar Rana (haɗin buɗewa), ko ma an kama shi daga wani tsarin taurari. Wani hasashe ya nuna cewa yanayin sa na iya zama hujja ga wata babbar duniyar da ke bayan yanayin Neptune. Masanin taurari Michael E. Brown, wanda ya gano Sedna da dwarf taurari Eris, Haumea, da Makemake, yana tunanin cewa shi ne mafi mahimmancin ilimin kimiyya na trans-Neptunian da aka samo har zuwa yau, saboda fahimtar yanayin da ba a saba da shi ba zai iya samar da bayanai masu mahimmanci game da...  Tambaya: Wane launi ne farfajiyar duniyar Sedna?
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