The Scriptural expression “heaven and earth” means all that exists, creation in its entirety. It also indicates the bond, deep within creation, that both unites heaven and earth and distinguishes the one from the other: “the earth” is the world of men, while “heaven” or “the heavens” can designate both the firmament and God’s own “place” – “our Father in heaven” and consequently the “heaven” too which is eschatological glory. Finally, “heaven” refers to the saints and the “place” of the spiritual creatures, the angels, who surround God.
The profession of faith of the Fourth Lateran Council (1215) affirms that God “from the beginning of time made at once (simul) out of nothing both orders of creatures, the spiritual and the corporeal, that is, the angelic and the earthly, and then (deinde) the human creature, who as it were shares in both orders, being composed of spirit and body.”
From the Catechism of the Catholic Church 325-327