Matsayi: Ya ƙunshi da farko daga dutsen silicate da baƙin ƙarfe, Io yana kusa da haɗin gwargwadon abubuwan da ke cikin duniya fiye da sauran tauraron dan adam a cikin tsarin hasken rana na waje, waɗanda galibi sun haɗa da cakuda ruwan kankara da silicates. Io yana da nauyin 3.5275 g / cm3, mafi girma daga kowane wata a cikin Solar System; ya fi girma fiye da sauran tauraron dan adam na Galilean (Ganymede da Callisto musamman, wanda ƙididdigar ƙididdigar su ke kusa da 1.9 g / cm3) kuma kadan mafi girma (~ 5.5%) fiye da 3.344 g / cm3 na Moon. Samfura bisa ga Voyager da Galileo na ma'aunin Io, radius, da quadrupole coefficients na nauyi (ƙididdigar adadi da ke da alaƙa da yadda ake rarraba taro a cikin teku) da aka rarraba tsakanin tsakiya mai wadata da silicate da kuma mandala mai ƙarancin ƙarfe da baƙin ƙarfe.
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