Additionally, early Christians were not, as is commonly assumed, bound to a three-tier vision of the universe, i.e., heaven, hell, and earth.
[W]hen the Bible speaks of heaven and earth it is not talking about two localities related to each other within the same space-time continuum or about a nonphysical world contrasted with a physical one but about two different kinds of what we call space, two different kinds of what we call matter, and also quite possibly (though this does not necessarily follow from the other two) two different kinds of what we call time.
So heaven and earth, understood in this way, are two dimensions of the same reality. They “interlock and intersect in a whole variety of ways even while they retain, for the moment at least, their separate identities and roles.” Combine this with the doctrine of the ascension and we do not have a Jesus who floats up into a heaven “up there” but disappears into a reality we cannot yet see. Because heaven and earth are not yet joined Jesus is physically absent from us. At the same time he is present with us through the Holy Spirit and the sacraments, linkages where the two realities meet in the present age.
— Vatican Library (@vaticanlibrary) May 30, 2019