The balance between matter and dark energy in that sphere does not significantly change even as the rest of the cosmos seems to inexorably empty out. If your original sphere contains a cluster of galaxies and some quantity of dark energy, in a billion years the amount of dark energy in that region will still be the same, so if it wasn’t enough to mess up the galaxy cluster before, it won’t be in the future. It also means that if you draw a sphere of a given size anywhere in the universe and measure the amount of dark energy inside the sphere, and then do the same at some future time, you’ll always get the same number, regardless of how much the outside universe has expanded in the meantime. This makes sense in a way, if every bit of space is automatically assigned a set amount of dark energy within it, but it’s still super weird, because it means that as space gets bigger, the amount of dark energy increases to keep the density constant.
The expansion rate isn’t constant, just the density of the stuff itself, in any given volume of space. If dark energy is a cosmological constant, its defining feature is that the density of dark energy in any given part of space is constant over time, even as space expands. The reason for this small mercy of the cosmological constant (which, to be fair, does still destroy the whole universe eventually) lies in the “constant” part of the story. What the cosmological constant cannot do is break apart anything that is already, in any sense, a coherent structure: What therefore gravity hath joined together, let not a cosmological constant put asunder. They also form a bit more slowly in the presence of a cosmological constant than they otherwise would. It can be more properly thought of as a force for isolation-if two galaxies are already distant from one another, they get more distant, and individual galaxies, clusters, or groups of galaxies find themselves more and more alone as time goes on. But within galaxies, solar systems, or in the close vicinity of organized matter generally, a cosmological constant has no effect. On large scales, this is a pretty good description. It's like having a face on your back, but a lot less weird and gross.Dark energy is often assumed to be a cosmological constant that stretches space out, accelerating cosmic expansion by imbuing the universe with some inherent inclination for swelling. With thousands of unique designs to choose from, printed for you when you order, your backpack helps you express your personality no matter which direction you’re pointing. And speaking of pockets, every backpack you buy puts money in an artist's pocket. Whether you need a cute, fashionable daypack for your next travel adventure, or a cool rucksack to go from the office to the gym, these spacious backpacks include adjustable padded shoulder straps, an internal laptop pocket, and an exterior mesh side pocket. Now some more geniuses (the independent artists on Redbubble) are creating and selling original designs to elevate the humble backpack from workhorse to showhorse.
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