The first heaven is our atmosphere where we live and serve the Lord. It is where the Psalmist says, “the fowls of the heaven have their habitation, which sing among the branches” (Psa. 104:12).
The second heaven is the solar system that consists of the sun, moon, stars, and planets (Gen. 1:14-18). Prior to the written revelation of God, the Lord used this realm as a teaching tool. Once again, in the words of the Psalmist, “The heavens declare the glory of God; and the firmament [expanse] sheweth His handiwork. Day unto day uttereth speech, and night unto night sheweth knowledge” (Psa. 19:1,2). While Satan currently dwells in the second heaven, he will be cast out of heaven to the earth in the middle of the Tribulation period (Rev. 12:7-12). Throughout eternity, the members of the Body of Christ will occupy this realm and its various seats of authority (Eph. 2:6).