A construction similar to the then world (2Pe 3:6). The now heavens, or the present heavens.
Kept in store (τεθησαυρισμένοι)
Rev., stored up. Lit., treasured up. The same word which is used in Luk 12:21, layeth up treasure. Sometimes with the kindred noun θησαυροὺς, treasures, as Mat 6:19; lit., treasure treasures.
Unto fire
Some construe this with treasured up; as Rev., stored up for fire; others with reserved, as A. V.; others again give the sense stored with fire, indicating that the agent for the final destruction is already prepared.