<p>It seems that we live in a universe which is accelerating, but with a decreasing Hubble constant (See <a href="https://astronomy.stackexchange.com/questions/18880/">How is the Universe&#39;s Expansion Accelerating if the Hubble Constant is Decreasing?</a>)</p>
<p>In this universe the Hubble volume expands with time, and can overtake sources that are currently more distant than the Hubble length.  That is the Hubble length increases faster than those objects are receding. And so the mass in the Hubble volume will increase.</p>
<p>(<a href="https://en.wikipedia.org/wiki/Hubble_volume#:%7E:text=Similarly%2C%20in%20an%20accelerating%20universe%20with%20a%20decreasing%20Hubble%20constant%2C%20the%20Hubble%20volume%20expands%20with%20time" rel="nofollow noreferrer">from Wikipedia</a>, which cites <a href="https://arxiv.org/pdf/astro-ph/0310808.pdf" rel="nofollow noreferrer">Expanding Confusion:common misconceptions of cosmological horizons
and the superluminal expansion of the universe</a>)</p>

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2022-12-11T16:32:59.890Z
Are there any precise mass estimates on this (for example: in kg)?  I've noticed that the mass + energy content of a Hubble volume (at this moment) is very close to that of a corresponding black hole and I'd like to know if this was always true or if this is true only for a given period of time.
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2022-12-11T16:47:19.620Z
I think you're talking about a black hole cosmology.  https://en.wikipedia.org/wiki/Black_hole_cosmology  and see https://physics.stackexchange.com/questions/412998/why-are-there-a-bunch-of-cosmological-coincidences
James K
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2022-12-10T16:04:32.887Z
2022-12-10T20:44:54.600Z
2022-12-10T20:44:54.600Z
James K
<p>How does the mass encased within the Hubble sphere/volume (both proper and comoving) change with time?</p>

<universe><mass>
Mass Content of the Hubble Sphere
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# Mass Content of the Hubble Sphere

(Asked by: username_0 on 2022-12-10)

How does the mass encased within the Hubble sphere/volume (both proper and comoving) change with time?

**Tags:** universe, mass


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## 1 answers

### Answer by username_1 on 2022-12-10. Score: 4

It seems that we live in a universe which is accelerating, but with a decreasing Hubble constant (See [How is the Universe's Expansion Accelerating if the Hubble Constant is Decreasing?](https://astronomy.stackexchange.com/questions/18880/))

In this universe the Hubble volume expands with time, and can overtake sources that are currently more distant than the Hubble length. That is the Hubble length increases faster than those objects are receding. And so the mass in the Hubble volume will increase.

([from Wikipedia](https://en.wikipedia.org/wiki/Hubble_volume#:%7E:text=Similarly%2C%20in%20an%20accelerating%20universe%20with%20a%20decreasing%20Hubble%20constant%2C%20the%20Hubble%20volume%20expands%20with%20time), which cites [Expanding Confusion:common misconceptions of cosmological horizons
and the superluminal expansion of the universe](https://arxiv.org/pdf/astro-ph/0310808.pdf))

> **Comments:**
> **username_0**: Are there any precise mass estimates on this (for example: in kg)?  I've noticed that the mass + energy content of a Hubble volume (at this moment) is very close to that of a corresponding black hole and I'd like to know if this was always true or if this is true only for a given period of time.  
> **username_1**: I think you're talking about a black hole cosmology.  https://en.wikipedia.org/wiki/Black_hole_cosmology  and see https://physics.stackexchange.com/questions/412998/why-are-there-a-bunch-of-cosmological-coincidences  

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