The big theoretical problem of dark energy | by Ethan Siegel | Starts With A Bang! | Mar, 2023

In a Universe that comes to be dominated by dark energy, there are four regions: one where everything within it is reachable and observable, one where everything is observable but unreachable, one where things will someday be observable, and one where things will never be observable. The numbers correspond to our consensus cosmology as of early 2023. (Credit: Andrew Z. Colvin/Wikimedia Commons; annotations: E. Siegel)

One of the most fundamental questions we can ask about our Universe itself is “what makes it up?” For a long time, the answer seemed obvious: matter and…

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