People used to think Earth was the only planet. Then they thought the Sun was the only star. Then they thought the Milky Way was the only galaxy. Do you still believe there is only one universe?

It dawned on me that there must be multiple universes.

Edit: Cool quote from Neil Degrasse Tyson on the subject:

"Philosophically, the universe has really never made things in ones. The Earth is special and everything else is different? No, we’ve got seven other planets. The sun? No, the sun is one of those dots in the night sky. The Milky Way? No, it’s one of a hundred billion galaxies. And the universe–maybe it’s countless other universes."

And guys and girls, I'm not implying that this proves the multi-verse theory. Its just something that crossed my mind that I felt was worth mentioning. This is not evidence or an argument, it is simply a thought - hence the posting in Showerthoughts.

Edit 2: A lot of people seem to be up in arms about my "Sun only star" comment. I guess I phrased this incorrectly. Again, not a Science thread, so relax.