SWaB: What does Earth look like from across the Universe?

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SWaB: What does Earth look like from across the Universe?

#1

Post by notFritzArgelander »


Scopes: Refs: Orion ST80, SV 80EDA f7, TS 102ED f11 Newts: AWB 130mm, f5, Z12 f5; Cats: VMC110L, Intes MK66,VMC200L f9.75 EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, Plossl 32-8mm. Mixed brand Masuyama/Astroplans Binoculars: Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker IV, Vixen Porta II, Celestron CG5
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Re: SWaB: What does Earth look like from across the Universe?

#2

Post by helicon »


Kind of a mind blowing article. From the perspective of distant galaxies dinosaurs would still be roaming the earth, eventually followed by marsupials and placental animals, and finally homo erectus and paleolithic man.
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Re: SWaB: What does Earth look like from across the Universe?

#3

Post by Lady Fraktor »


A interesting read :)
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Re: SWaB: What does Earth look like from across the Universe?

#4

Post by chasmanian »


loved this nFA!!
also subscribed to Ethan's website.

and there's a link in this article, to another of his articles (maybe you posted it when it came out).
there are 6 to 20 trillion galaxies in our Observable Universe.
wow!! multiply that by the number of stars in these galaxies.
I just broke my calculator. :)

https://bigthink.com/starts-with-a-bang ... -universe/
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Re: SWaB: What does Earth look like from across the Universe?

#5

Post by notFritzArgelander »


chasmanian wrote: Mon Oct 03, 2022 9:51 pm loved this nFA!!
also subscribed to Ethan's website.

and there's a link in this article, to another of his articles (maybe you posted it when it came out).
there are 6 to 20 trillion galaxies in our Observable Universe.
wow!! multiply that by the number of stars in these galaxies.
I just broke my calculator. :)

https://bigthink.com/starts-with-a-bang ... -universe/
No, I missed that. I think I was traveling at the time. Thanks.
Scopes: Refs: Orion ST80, SV 80EDA f7, TS 102ED f11 Newts: AWB 130mm, f5, Z12 f5; Cats: VMC110L, Intes MK66,VMC200L f9.75 EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, Plossl 32-8mm. Mixed brand Masuyama/Astroplans Binoculars: Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker IV, Vixen Porta II, Celestron CG5
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Re: SWaB: What does Earth look like from across the Universe?

#6

Post by chasmanian »


its a great article, have a look at it nFA!! :)
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Re: SWaB: What does Earth look like from across the Universe?

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Post by chasmanian »


nFA,
I googled how many stars in the Universe.
and found this.
assume all of this is for our Observable Universe.

its an article by Ethan, from 1 day short of 1 year ago. (hmmmm, synchronicity.)
he says there are ~ 2 trillion galaxies in the Universe.
he uses the Milky Way's 100 billion stars, for an average number of stars in a galaxy.
and thus there are approximately 200 billion trillion stars in the Universe.

well, methinks the update needs to be increased,
because in June's article, he says there are ~ 6 -20 trillion galaxies.

simple math gives us now
600 billion trillion
to
2000 billion trillion (or 2 trillion trillion) stars in the Observable Universe.

I wonder if that estimate might go higher again someday. :)
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Re: SWaB: What does Earth look like from across the Universe?

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Post by notFritzArgelander »


chasmanian wrote: Tue Oct 04, 2022 1:05 am nFA,
I googled how many stars in the Universe.
and found this.
assume all of this is for our Observable Universe.

its an article by Ethan, from 1 day short of 1 year ago. (hmmmm, synchronicity.)
he says there are ~ 2 trillion galaxies in the Universe.
he uses the Milky Way's 100 billion stars, for an average number of stars in a galaxy.
and thus there are approximately 200 billion trillion stars in the Universe.

well, methinks the update needs to be increased,
because in June's article, he says there are ~ 6 -20 trillion galaxies.

simple math gives us now
600 billion trillion
to
2000 billion trillion (or 2 trillion trillion) stars in the Observable Universe.

I wonder if that estimate might go higher again someday. :)
It’s unlikely to go down :)
Scopes: Refs: Orion ST80, SV 80EDA f7, TS 102ED f11 Newts: AWB 130mm, f5, Z12 f5; Cats: VMC110L, Intes MK66,VMC200L f9.75 EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, Plossl 32-8mm. Mixed brand Masuyama/Astroplans Binoculars: Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker IV, Vixen Porta II, Celestron CG5
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Re: SWaB: What does Earth look like from across the Universe?

#9

Post by chasmanian »


thanks nFA.

I just thought about how dark matter makes up 5 times more than regular matter, of the cosmos.

and googled the percentage of regular matter in stars and found this.
I really like the pie chart graphics.
they show very clearly and in a very easy to understand way, the make up.

https://www.esa.int/ESA_Multimedia/Imag ... y%20matter.
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Re: SWaB: What does Earth look like from across the Universe?

#10

Post by notFritzArgelander »


chasmanian wrote: Tue Oct 04, 2022 1:55 am thanks nFA.

I just thought about how dark matter makes up 5 times more than regular matter, of the cosmos.

and googled the percentage of regular matter in stars and found this.
I really like the pie chart graphics.
they show very clearly and in a very easy to understand way, the make up.

https://www.esa.int/ESA_Multimedia/Imag ... y%20matter.
While I’m not a fan of the overuse of pie charts this one tells a good story: little of the baryon matter is in stars and galaxies.
Scopes: Refs: Orion ST80, SV 80EDA f7, TS 102ED f11 Newts: AWB 130mm, f5, Z12 f5; Cats: VMC110L, Intes MK66,VMC200L f9.75 EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, Plossl 32-8mm. Mixed brand Masuyama/Astroplans Binoculars: Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker IV, Vixen Porta II, Celestron CG5
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Re: SWaB: What does Earth look like from across the Universe?

#11

Post by chasmanian »


thank you nFA.
I feel the same as you about both things you said. :)

I next wondered if we know if more stars are being born than dying (and going to the star happy hunting ground, or white dwarf neutron star and black hole states).

I googled, read a bit. not real clear info.
do you please possibly have any thoughts on this?

and by the way, it occurs to me, that Ethan's estimate of how many stars are in the Observable Universe, most likely isn't even including Hollywood stars.
like Scarjo and Alyssa Milano. :)
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Re: SWaB: What does Earth look like from across the Universe?

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Post by notFritzArgelander »


chasmanian wrote: Wed Oct 05, 2022 3:03 am thank you nFA.
I feel the same as you about both things you said. :)

I next wondered if we know if more stars are being born than dying (and going to the star happy hunting ground, or white dwarf neutron star and black hole states).

I googled, read a bit. not real clear info.
do you please possibly have any thoughts on this?

and by the way, it occurs to me, that Ethan's estimate of how many stars are in the Observable Universe, most likely isn't even including Hollywood stars.
like Scarjo and Alyssa Milano. :)
Fortunately we are at the peak of star formation of the likes of ScarJo and AM. :)

However the formation of stars massive enough to fuse hydrogen was about 5-8 billion years ago and we are currently forming new stars at about 1/10 of the peak rate according to this study. There are large uncertainties here.

https://arxiv.org/abs/astro-ph/0403293
The determination of the star-formation history of the Universe is a key goal of modern cosmology, as it is crucial to our understanding of how structure in the Universe forms and evolves. A picture has built up over recent years, piece-by-piece, by observing young stars in distant galaxies at different times in the past.
These studies indicated that the stellar birthrate peaked some 8 billion years ago, and then declined by a factor of around ten to its present value. Here we report on a new study which obtains the complete star formation history by analysing the fossil record of the stellar populations of 96545 nearby galaxies. Broadly, our results support those derived from high-redshift galaxies elsewhere in the Universe. We find, however, that the peak of star formation was more recent - around 5 billion years ago. Our study also shows that the bigger the stellar mass of the galaxy, the earlier the stars were formed. This striking result indicates a very different formation history for high- and low-mass formation.
Scopes: Refs: Orion ST80, SV 80EDA f7, TS 102ED f11 Newts: AWB 130mm, f5, Z12 f5; Cats: VMC110L, Intes MK66,VMC200L f9.75 EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, Plossl 32-8mm. Mixed brand Masuyama/Astroplans Binoculars: Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker IV, Vixen Porta II, Celestron CG5
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Re: SWaB: What does Earth look like from across the Universe?

#13

Post by chasmanian »


wow, thank you nFA.
and much appreciate your comment about stars the likes of Scarjo and AM. :)
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Re: SWaB: What does Earth look like from across the Universe?

#14

Post by helicon »


More than a googol of stars...more stars in the universe than cells in every living thing on earth?
-Michael
Refractors: ES AR152 f/6.5 Achromat on Twilight II, Celestron 102mm XLT f/9.8 on Celestron Heavy Duty Alt Az mount, KOWA 90mm spotting scope
Binoculars: Celestron SkyMaster 15x70, Bushnell 10x50
Eyepieces: Various, GSO Superview, 9mm Plossl, Celestron 25mm Plossl
Camera: ZWO ASI 120
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