Heaven is a place that was once joined together with the primordial Earth, they were separated before land and life appeared and Heaven now forms a circle - a hammered-out bracelet - around the small, rocky planets. It can be visualized as a serpent devouring its tail or a celestial dragon. The Lost Red Paint people of the NE Atlantic coast left behind rock art maybe ~7,000 years old showing a stick figure man next to a star with a serpent on the other side forming a half circle around the man and star. I believe that was how they saw Heaven.
The Maya and Toltec believed Heaven was layered, 13 levels altogether with the creator god occupying 2 levels. The #13 also played a role in Incan cosmology with their creator (Viracocha) appearing as an ellipse surrounded by 11 celestial bodies.
The #9 was of significance too, Viracocha joins (or separates) 2 groups of celestial objects numbering 4 and 5. And yet around the time of Christ the Nascans depicted their creator (in the form of a monkey) peering down between his hands with 4 and 5 digits. The #9 also shows up in the architecture of Chichen Itza (El Castillo has 9 levels with a temple for the creator on top), these represent the 9 "Lord of the Night".
From Dante to Yggdrasil and Siberian shaman to the new world, 9 is of celestial importance. I dont know what happens after death, could be just worm food or maybe reincarnation or release from this plane of existence, but Heaven is a place and according to various scriptures, its a place the living may visit with God's blessing and help, not the dead.
Oh yeah, the Sumerians depicted our solar system on a 4,000+ years old cylinder seal (VA 243) - a star surrounded by 11 celestial objects. This matches up with their creation story now known as the Enuma Elish, it describes the appearance of 10 gods before Marduk (Babylonian version of the creator) slays and dismembers Tiamat to form Heaven and Earth.