'Heavens' in the Bible

After Jesus was baptized, He came up immediately out of the water; and behold, the heavens were opened, and he (John) saw the Spirit of God descending as a dove and lighting on Him (Jesus),

“Immediately after the tribulation of those days the sun will be darkened, and the moon will not provide its light, and the stars will fall from the sky, and the powers of the heavens will be shaken.