The idea of heaven is that it is a place where God is. Where is God, what place contains Him? God is omnipresent and existed before heaven or Earth. God is in all places and times with all knowledge and wisdom and all power and glory simultaneously and eternally. God is not in heaven heaven is in God. Heaven is not a place, it is being with God, it is experiencing God in all His glory. There is no place that can contain the most high. If God is not in something then it does not exist because God upholds all He created by His will for them to exist. It is impossible for heaven to be a place that contains God. The idea of that is contrary to all God is. This is one of those deep things of God.