we are universe unto are self's for we are made of the stars, we are atoms, molecules each orbiting different things.
When we collide we create another a new universe is born from the star dust of both and through time it will grow.
Are universe ages, super nova's explode as parts of the universal body shuts down. Like all things a universe too must come to an end.
But a new one carries on, part of the old universe does live on, but now it has past on. all its suns now dead extinguished, but remembered not forgotten as each will be reborn in the next generation of new star dust and suns.