Saturday Conversation at the Rideouts

Isabelle (2nd grade):  "Daddy, tell me again about the multiverses and how there could be other universes?"
Me: "Well, everything we can currently or will ever be able to see is the Universe, but there are (or could be) other universes out there but we'll never have any evidence for it."
Isabelle: "Then it's not really science, is it?  It's just an idea."
Me: "True, but the idea of multiverses is consistent with the science we do know."
Isabelle: "But why would you say we'll never be able to see something far away? If we wait long enough, won't the light eventually get here?"
Me: "Good point, but the universe is expanding so the distant objects are actually getting more distant all the time"
Isabelle: "But the light it emits now, before it moves away, will still get to us eventually, right?"
Me (starting to sweat): "Yes it seems that way, but it's actually the space between us that is expanding and so that makes it hard for the light to get to us."
Isabelle: "Expanding faster than the speed of light?  I don't understand that"
Me: "Um, yes, well, if the object is really far away then there is a lot of space and every piece of it is expanding, then the object could actually be moving away from us faster than the speed of light."
Isabelle: "But the light should still get to us!"
Me: "But the light is traveling through space that is expanding too, so it's like the light is running towards us while the floor itself is getting bigger and it's as if the light is running in place."
Isabelle: "I don't get it"
Me: "Me neither."(thinking: maybe I shouldn't show her any more episodes of Cosmos)