RobH_en_tn/1co/15/40.md

heavenly bodies

Possible meanings are 1) the sun, moon, stars, and other visible lights in the sky or 2) heavenly beings, such as angels and other supernatural beings.

earthly bodies

This refers to humans.

the glory of the heavenly body is one kind and the glory of the earthly is another

"the glory that heavenly bodies have is different from the glory of human bodies"

glory

Here "glory" refers to the relative brightness to the human eye of objects in the sky.