The creation scientists theorize that the universe is bounded and has a center which is in close proximity to our Milky Way galaxy, cosmic center (our solar system to a region smaller than our galaxy), or Earth is approximately the center (geocentric, but this theory is being discredited by many creation scientists). There are white papers and peer-review papers written on the bounded universe and our galaxy being the center. It's a large approximation, but compared to the universe it is pretty good. The boundary or edge explains the white hole cosmology which states the universe would only be a few thousand years old by a clock on Earth, but by a clock at the edge of the universe it would be billions of years old. The key to this model is the idea that time was much slower on Earth than distant parts of the universe, on day 5 of the creation. There is no dark energy or dark matter. Otherwise, it relies on presuppositions or starting assumptions from the Big Bang Theory so there is some overlap. Many think God is outside our universe if He created it, but there are three meanings to heaven -- place for God and the angels, interstellar space and earth's atmosphere. The place for God and the angels is timeless, spaceless and immaterial so it is assumed to be outside our universe or in another plane or another dimension (5th dimension?) from our reality. Whether it is within or without our universe is not known, i.e. it's location is not known, but the angels and saints have the ability to move from heaven (timeless, spaceless and immaterial) to time, space and material world and back.