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Isn't the phrasing "density of space" a bit off? I mean a density is a scalar quantity of something per unit of space. So Density of Space would literally mean quantity of space per unit of space?

Reading the article it would make much more sense to say: Density of Matter in Space Outside of the Solar System.

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The word "density" means mass per unit volume. It's sometimes qualified like "charge density" for (assumed, in turn, to be electric) charge per unit volume, but "density of charge" would mean mass per unit volume of charge, like "density of iron", means mass per unit volume of iron.

So density of space is mass per unit volume of space, not space per unit volume.

I think it’s off.

It felt like saying “the velocity of distance”

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