The primary reason, that accounts for this difference in our body types is SIN. While the heavenly beings live in HOLINESS and free from sin; we, here on earth reign and live in SIN. That is why, we cannot have this shekinah glory's experience (the dwelling of the presence of God upon us that transforms us into the heavenly image, until the flesh is completely destroyed in our bodies. See the example of God and Moses on mount sinai in Exodus 34:29-35. When Moses spent 40 days and nights with the shekinah glory (in the presence of God) on Mount Sinai; while coming down from the MOUNTAIN, his face was already shining like light; because of the shekinah glory's effect (glory of the presence of God). As a result, the people were afraid to come near him. This was so, because, when Moses was admitted into the presence of God on the mountain; God removed SIN out of him; but after the experience, on his way down the mountain, SIN was restored in him. That was why in verse 33, Moses would always cover his face with a veil after talking to the people; so that: they do not see the brightness of the light fading away. But would however, remove the veil when he goes into the tent to meet the Lord in order to renew the brightness of the glory of God shining on his face as light. I must also mention that: the veil here, symbolizes SIN. So that: when Moses faces God, He (God) removes it (SIN) in him; but when back to the people, it (SIN) is restored in him. Finally, this is me revealing the major difference between the type of bodies that we have as human beings to those of the heavenlies. While theirs, is more beautiful, stronger and radiating the brightness of God, because of the presence of God that they are with and the lack of SIN; ours is weaker, less beautiful and in the dark, because of the flesh (Devil) and SIN that reign in us. So, for us to have same experience as they have, we must die completely to this FLESH and SIN; so that: we can be transformed into the same GLORY and NATURE as they are, by the SPIRIT. See 2corinthians 3:18. The Lord bless us all I pray.