An asteroid hitting a nuclear plant would not destroy the earth. If all the nuclear plants on the Earth exploded at once, they would not destroy the earth. they may kill most of the life here if they did, but they would not destroy the earth.<quoted text>
First if a massive asteroid hits Earth, we're doomed especially if it hits a nuclear plant. And when Earth is gone, it will affect the moon and it will affect the other planets. It will affect our solar system and the sun will die out like death of stars and galaxies. But I don't think it would be the end of the universe. The universe will continue to exist. But it will be different.
Why would the sun die out if the planets were gone? it would continue burning its fuel as always.