'Sky' in the Bible

‘And I will bring about wonders in the sky aboveAnd signs (attesting miracles) on the earth below,Blood and fire and smoking vapor.

and he saw the sky opened up, and an object like a great sheet descending, lowered by its four corners to the earth,

After the town clerk had quieted the crowd, he said, “Men of Ephesus, what person is there who does not know that the city of the Ephesians is the guardian of the temple of the great Artemis and of that [sacred stone image of her] which fell from the sky?