<prompt> I-Spectroscopy iveze ukuthi ukwakheka kobuso be-Sedna kufana nokwezinye izinto ze-trans-Neptunian, okuyinhlanganisela enkulu yamanzi, i-methane, ne-nitrogen i-ice ene-tholins. Ubuso bayo bungenye yezinto ezibomvu kakhulu phakathi kwezinto ze-Solar System. Cishe iyi-planet ye-Sedna. Phakathi kwezinto eziyisishiyagalombili ezinkulu kakhulu ze-trans-Neptunian, i-Sedna iyona kuphela engaziwa ukuthi ayinayo inyanga. Ngokuningi lwayo, i-Sedna ikude kakhulu kuneLanga njengamanje, ne-aphelion yayo e-Neptunian icishe ibe yi-9,371 AU kude ne-Neptunian.  <response>: obomvu 