Follow-up:

On Friday, January 15, 2021 at 11:40:08 AM UTC-6, observer wrote:

..> ---
..>
..> Quick and easiest answer, unknown & unknowable
..> at the present time, but if humankind survives its
..> infancy & if artificial intelligence dramatically expon-
..> entially explodes the boundaries of what is knowable
..> (without killing us), who can say what will be known
..> by humans with enhanced artificial intelligence 100,
..> 1,000, 10,000, 100,000 years from now?
..>
..> ~~~
..>
..> Universes?
..>
..> Starting with universes, some theories suggest the
..> particular space-time continuum we exist within is
..> but one of a multitude of universes, perhaps one of
..> an *infinite* number of universes, the totality of all
..> that exists best thought of as a probably unprovably
..> infinite multiverse.

The Multiverse Hypothesis Explained
by Neil deGrasse Tyson
https://youtu.be/h6OoaNPSZeM

..>
..> Hmmmm.
..>
..> ~~~
..>
..> Galaxies?
..>
..> In our particular space-time continuum, it was once
..> thought that there are 2 trillion galaxies. Now? Per
..> the following, all the article says is "hundreds of
..> billions".
..> https://www.dailymail.co.uk/sciencetech/article-9148233/Nasa-finds-far-fewer-galaxies-thought.html
..>
..> How big are they? Average is arguably unknowable
..> being that galaxies are extremely variable in size &
..> shape & to the best of my knowledge, only a minus-
..> cule number have been examined & categorized.
..> https://www.universetoday.com/wp-content/uploads/2013/04/Galaxy-Size-Comparison-Chart.jpg
..>
..> ~~~
..>
..> Stars?
..>
..> As for number of stars, if there were such a thing as
..> an 'average' galaxy, which to the best of my knowledge
..> hasn't been arrived at, you'd simply multiply the number
..> of galaxies times average stars in a galaxy to arrive at
..> an estimated number of stars.
..>
..> So, let's say there are 300 billion galaxies, & let's say
..> there are 200 billion stars per galaxy, so 300 billion
..> times 200 billion = 60,000,000,000,000,000,000,000
..> stars (60 sextillion).
..>
..> ~~~
..>
..> Black Holes?
..>
..> Black holes, "according to NASA, 1 in 1,000 stars are
..> large enough to collapse into a black hole." Of course,
..> that doesn't tell us how many have already collapsed,
..> so if you simply take half that number, you'd have 1
..> in 2,000 stars as your number for black holes, mean-
..> ing 60 sextillion divided by 2,000 = the number of ...
..>
..> ... black holes, which = 30,000,000,000,000,000,000
..> black holes (30 quintillion), wild guessing involved as
..> the only thing detectable is the gravitational impact of
..> a black hole & those gravitational impacts have only
..> been detected for super-massive black holes.
..>
..> ~~~
..>
..> Planets?
..>
..> I've read an estimate (and I suspect this is just a guess)
..> there are an average of 1.6 planets per star in the Milky
..> Way galaxy, so if that's true & planet formation is similar
..> in all other galaxies, there would be about 96 sextillion
..> planets. Of course, it's extremely difficult to see planets
..> as they're so tiny relative to stars, so wild guessing is
..> entailed here.
..>
..> ~~~
..>
..> Moons?
..>
..> Moons, well, the following states there are over 200 in
..> our solar system, so if you divide by 8, the average per
..> planet would = 25, so if you multiply that by 96 sextillion,
..> there would be about 2.4 septillion moons. To the best
..> of my knowledge, no moon has ever been seen outside
..> our solar system, so wild guessing is involved here.
..> https://solarsystem.nasa.gov/moons/overview/
..>
..> ---
..>
..> Reference for Names of Large Numbers
..> https://www.learntalkmoney.com/big-numbers-googol-zillion/
..>
..> Name .......... Zeroes
..>
..> million ......... 6 .... 1,000,000
..> billion .......... 9 .... 1,000,000,000
..> trillion ......... 12 ... 1,000,000,000,000
..> quadrillion .. 15 ... 1,000,000,000,000,000
..> quintillion ... 18 .... 1,000,000,000,000,000,000
..> sextillion ..... 21 ... 1,000,000,000,000,000,000,000
..> septillion ..... 24 ... 1,000,000,000,000,000,000,000,000
..>
..> *--- --- --- --- --- --- --- --- --- --- --- ---*

Follow-up 2:

---
June 22 2022

Latest estimate on number of galaxies
and number of stars in our particular
space-time continuum
https://bigthink.com/starts-with-a-bang/galaxies-in-universe/
---

On Sunday, October 24, 2021 at 7:24:11 PM UTC-5, observer wrote:

> Follow-up:
> On Friday, January 15, 2021 at 11:40:08 AM UTC-6, observer wrote:
/> .> ---
/> .>
/> .> Quick and easiest answer, unknown & unknowable
/> .> at the present time, but if humankind survives its
/> .> infancy & if artificial intelligence dramatically expon-
/> .> entially explodes the boundaries of what is knowable
/> .> (without killing us), who can say what will be known
/> .> by humans with enhanced artificial intelligence 100,
/> .> 1,000, 10,000, 100,000 years from now?
/> .>
/> .> ~~~
/> .>
/> .> Universes?
/> .>
/> .> Starting with universes, some theories suggest the
/> .> particular space-time continuum we exist within is
/> .> but one of a multitude of universes, perhaps one of
/> .> an *infinite* number of universes, the totality of all
/> .> that exists best thought of as a probably unprovably
/> .> infinite multiverse.
..> The Multiverse Hypothesis Explained
..> by Neil deGrasse Tyson
..> https://youtu.be/h6OoaNPSZeM
/> .>
/> .> Hmmmm.
/> .>
/> .> ~~~
/> .>
/> .> Galaxies?
/> .>
/> .> In our particular space-time continuum, it was once
/> .> thought that there are 2 trillion galaxies. Now? Per
/> .> the following, all the article says is "hundreds of
/> .> billions".
/> .> https://www.dailymail.co.uk/sciencetech/article-9148233/Nasa-finds-far-fewer-galaxies-thought.html

Per the article above, "recent observational
evidence shows ... there are between 6 and
20 trillion galaxies out there."

/> .>
/> .> How big are they? Average is arguably unknowable
/> .> being that galaxies are extremely variable in size &
/> .> shape & to the best of my knowledge, only a minus-
/> .> cule number have been examined & categorized.
/> .> https://www.universetoday.com/wp-content/uploads/2013/04/Galaxy-Size-Comparison-Chart.jpg
/> .>
/> .> ~~~
/> .>
/> .> Stars?
/> .>
/> .> As for number of stars, if there were such a thing as
/> .> an 'average' galaxy, which to the best of my knowledge
/> .> hasn't been arrived at, you'd simply multiply the number
/> .> of galaxies times average stars in a galaxy to arrive at
/> .> an estimated number of stars.
/> .>
/> .> So, let's say there are 300 billion galaxies, & let's say
/> .> there are 200 billion stars per galaxy, so 300 billion
/> .> times 200 billion = 60,000,000,000,000,000,000,000
/> .> stars (60 sextillion).

I didn't follow the June 22 2022 article's
explanation of the number of stars in the
universe, but for some reason that num-
ber is lower than the 60 sextillion men-
tioned in the original post in this thread.

The article in this post says "... there are
.... about 2 sextillion stars in the Universe."

/> .>
/> .> ~~~
/> .>
/> .> Black Holes?
/> .>
/> .> Black holes, "according to NASA, 1 in 1,000 stars are
/> .> large enough to collapse into a black hole." Of course,
/> .> that doesn't tell us how many have already collapsed,
/> .> so if you simply take half that number, you'd have 1
/> .> in 2,000 stars as your number for black holes, mean-
/> .> ing 60 sextillion divided by 2,000 = the number of ...
/> .>
/> .> ... black holes, which = 30,000,000,000,000,000,000
/> .> black holes (30 quintillion), wild guessing involved as
/> .> the only thing detectable is the gravitational impact of
/> .> a black hole & those gravitational impacts have only
/> .> been detected for super-massive black holes.
/> .>
/> .> ~~~
/> .>
/> .> Planets?
/> .>
/> .> I've read an estimate (and I suspect this is just a guess)
/> .> there are an average of 1.6 planets per star in the Milky
/> .> Way galaxy, so if that's true & planet formation is similar
/> .> in all other galaxies, there would be about 96 sextillion
/> .> planets. Of course, it's extremely difficult to see planets
/> .> as they're so tiny relative to stars, so wild guessing is
/> .> entailed here.
/> .>
/> .> ~~~
/> .>
/> .> Moons?
/> .>
/> .> Moons, well, the following states there are over 200 in
/> .> our solar system, so if you divide by 8, the average per
/> .> planet would = 25, so if you multiply that by 96 sextillion,
/> .> there would be about 2.4 septillion moons. To the best
/> .> of my knowledge, no moon has ever been seen outside
/> .> our solar system, so wild guessing is involved here.
/> .> https://solarsystem.nasa.gov/moons/overview/
/> .>
/> .> ---
/> .>
/> .> Reference for Names of Large Numbers
/> .> https://www.learntalkmoney.com/big-numbers-googol-zillion/
/> .>
/> .> Name .......... Zeroes
/> .>
/> .> million ......... 6 .... 1,000,000
/> .> billion .......... 9 .... 1,000,000,000
/> .> trillion ......... 12 ... 1,000,000,000,000
/> .> quadrillion .. 15 ... 1,000,000,000,000,000
/> .> quintillion ... 18 .... 1,000,000,000,000,000,000
/> .> sextillion ..... 21 ... 1,000,000,000,000,000,000,000
/> .> septillion ..... 24 ... 1,000,000,000,000,000,000,000,000
/> .>
/> .> \*--- --- --- --- --- --- --- --- --- --- --- ---*/