I think the last two children are the new Adam and Eve. As for whether this planet is the Nth Earth, not necessarily, because the reason why the Earth was attacked in this movie seems to be that a star struck the sun, causing the sun's flames , if the alien spaceship saves a copy of the earth's species like Noah, I think they will copy their DNA in the near future, just like Nuwa in Chinese mythology created a human, just toss the mud Heap, and then back to earth.
The aliens here play a role similar to God. Children may know a little about cloning, flying, wireless communication, cars, etc., but they will be passed on to future generations. Because there is no real technical realization, they will eventually evolve. It is the myth of mankind, so when people read books like the Bible and myths in various places, they will say that some of the ancients flew in a fire-breathing ship or something.
By the way, there seems to be a saying that human civilization has been destroyed several times on the earth.
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