On: If The Universe Is Expanding, What's It Expanding Into?

[Shorel]

I think it is a valid question, not because it is valid in a strict physical sense, but because a lot of people can have the same doubts.

Carl Sagan would have provided an interesting anecdote or analogy to explain the answer instead of ridiculing whoever ask this.

Sadly, my writing skills are way lesser than those of Sagan.