What do you think is outside our universe?

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I have watched many scientist tv programs but it looks like no one knows anything about anything outside our universe. However, they do think that it ends at some point because they had this funny device that sent signal back as soon as it reached the end. So.. the question is, what do you think is outside our universe? Or do you think it's nothing there? Or maybe it's another universe and there is only one planet that fits for life in each universe? Or maybe.. we just all live in a box in some basement and the time is super slowmotion for us and that's why we think that we have been here for so many years? Discuss please :)