Ask Ethan: Is it all-or-nothing for the expanding Universe?

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Ask Ethan: Is it all-or-nothing for the expanding Universe?

One of the most remarkable revelations in our understanding of the cosmos is the fact that the Universe is expanding. Distant galaxies, on average, all appear to recede from us, with faster and faster recession speeds for galaxies that exist at greater distances. While individual objects and systems may be gravitationally bound together — stars and planets, galaxies, plus galaxy groups and clusters — the space between these structures is not onl…