The entire hierarchy of angels can best be described as an endlessly vast sphere of beings, who surround an unknowable centre-point, which is called God.
In the Quran it is said that from the tears shed by this great angel [Michael] over the sins of the faithful, cherubim are formed.
So far we still don't know whether angels are ethereal beings of light without substance or if they take a solid human form with real wings which actually enable them to fly.
The Angel is one of those Articles of Faith as unshakable as our belief in the existence of God, an atom, or the ill luck of the number 13.
