MUHAMMAD REVELATION 9:1

Revelation 9:1 And the fifth angel sounded, and I saw a star (messenger) fall from heaven unto the earth: and to him was given the key of the bottomless pit.

Heaven in the strongs concordance G3772 — Strong οὐρανός

ouranos
oo-ran-os’

Perhaps from the same as G3735 (through the idea of elevation); the sky; by extension heaven (as the abode of God); by implication happiness, power, eternity; specifically the Gospel (Christianity): - air, heaven ([-ly]), sky.