If Nothing Exists Outside the Universe_ What Is It Expanding Into
The universe isn't expanding into anything. Space itself is stretching, and the darkness between galaxies is growing [citation:2]. There is no edge, no outside, and no "place" it is expanding into. The concept of an outside is a trick of human imagination—time and space are properties of the universe itself [citation:1]. If you were to leave the universe, you would leave behind the rules of time and dimensions [citation:1]. The universe creates space as it grows. Let the quiet mystery of this cosmic truth carry you into a deep and restful sleep.
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