A Brief History of Time (According to 2 Peter)
Maybe the laws of physics have remained constant (but maybe not?), but at the vary least God’s way of relating to the world and his people (which we sometimes call a “covenant”) changes as we move from one age to the next. So the two ages are different, and that difference is a sign to the scoffers and to the church that God is at work and will bring about his purposes and promises.