Among the singular claims made by the Church of Jesus Christ of Latter-day Saints is that God dwells within our universe, not beyond it.
Perhaps that is hard doctrine for some. But, as Jesus once asked his disciples when some grumbled about His hard doctrine and left, "Wilt thou also go away?"
To believe that heaven exists within our universe does not change the omnipotence or the omniscience of God.
I have begun to read a little book entitled the Kolob Theorom, by LDS author Dr. Lynn Hilton. He goes so far as to assert - and is careful to note that he alone is responsible for his opinion -- that the dwelling place of God, Elohim, is in the center of our galaxy, a region of blazing stars that our probing technology has not been able to penetrate.
The concept of space, with its billions of stars and its unfathomable distances between them, and even the possibility of infinite worlds, is very exciting to me.