Your have said that the earth would be restored to its original condition in the Millennium. That brings a question to my mind. When the earth was created was it not under a “canopy” of water? Would that mean that a canopy will be over the earth again?
At the Creation, Earth was surrounded by a water vapor canopy (Genesis 1:6-8) that kept out harmful rays enabling the long life spans of the pre-flood era. God collapsed the canopy onto Earth at the time of the flood and lifespans immediately began getting shorter.
Since lifespans will be longer again during the Millennium (Isaiah 65:20) many scholars believe the canopy will be replaced at the time of the 2nd Coming when the Creation is restored to its original condition (Acts 3:21).