Comments and questions about the
APOD on the main view screen.
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Bayer
Post
by Bayer » Tue Oct 15, 2019 4:51 am
It's Rho Ophiuchi
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AVAO
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Post
by AVAO » Tue Oct 15, 2019 6:56 am
Congratulation, beautiful picture!
I would be interested to know why two images had to be overlaid?
Why it was not possible at one time?
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orin stepanek
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Post
by orin stepanek » Tue Oct 15, 2019 11:01 am
I liked the silhouette of the man and area at pages bottom! He is dwarfed by the enormous size of the Milky Way! Nice photo!
![Cool 8-)](./images/smilies/icon_cool.gif)
Orin
Smile today; tomorrow's another day!
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BillT
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Post
by BillT » Tue Oct 15, 2019 11:25 am
AVAO wrote: ↑Tue Oct 15, 2019 6:56 am
Congratulation, beautiful picture!
I would be interested to know why two images had to be overlaid?
Why it was not possible at one time?
The usual reason is that the sky is imaged using a long exposure with the camera on an equatorial tracking mount. This stops the stars trailing but blurs the foreground. The foreground image is taken with the camera fixed and the sky part of the former is combined with the foreground of the latter.
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neufer
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Post
by neufer » Tue Oct 15, 2019 11:58 am
orin stepanek wrote: ↑Tue Oct 15, 2019 11:01 am
I liked the silhouette of the man and area at pages bottom!
He is dwarfed by the enormous size of the Milky Way! Nice photo!
- Yeah...but only because they are not to scale.
Art Neuendorffer
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Chris Peterson
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Contact:
Post
by Chris Peterson » Tue Oct 15, 2019 12:59 pm
Bayer wrote: ↑Tue Oct 15, 2019 4:51 am
It's Rho Ophiuch
i
Could be. But doesn't have to be. It's just a convention... and it's convention that we do not need and which can be reasonably changed by simple usage. There's no rational reason to use the Latin genitive in purely English naming.
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RJN
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Post
by RJN » Tue Oct 15, 2019 1:15 pm
Bayer wrote: ↑Tue Oct 15, 2019 4:51 am
It's Rho Ophiuch
i
OK. I sometimes get these wrong. Thanks! I made the correction on the main NASA APOD. I also corrected one other typo. (Can anyone find it?)
- RJN
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TheZuke!
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Post
by TheZuke! » Tue Oct 15, 2019 1:35 pm
RJN wrote: ↑Tue Oct 15, 2019 1:15 pm
OK. I sometimes get these wrong. Thanks! I made the correction on the main NASA APOD. I also corrected one other typo. (Can anyone find it?)
- RJN
My guess...
instead of "The Galaxy Above",
because the photos were taken in south Brazil, it is The Galaxy Below.
B^)
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neufer
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Post
by neufer » Tue Oct 15, 2019 1:41 pm
RJN wrote: ↑Tue Oct 15, 2019 1:15 pm
Bayer wrote: ↑Tue Oct 15, 2019 4:51 am
It's Rho Ophiuch
i
OK. I sometimes get these wrong. Thanks! I made the correction on the main NASA APOD.
I also corrected one other typo. (Can anyone find it?) - RJN
a bright planet Jupiter => the bright planet Jupiter
Art Neuendorffer
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Ann
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Post
by Ann » Tue Oct 15, 2019 4:35 pm
TheZuke! wrote: ↑Tue Oct 15, 2019 1:35 pm
RJN wrote: ↑Tue Oct 15, 2019 1:15 pm
OK. I sometimes get these wrong. Thanks! I made the correction on the main NASA APOD. I also corrected one other typo. (Can anyone find it?)
- RJN
My guess...
instead of "The Galaxy Above",
because the photos were taken in south Brazil, it is
The Galaxy Below.
B^)
Girls contemplating their mobile phones, and maybe the Galaxy below!
Photo: I don't know.
Yeah... it's a well-known fact that people down under walk with their feet in the air!
Ann
Color Commentator
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BDanielMayfield
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Post
by BDanielMayfield » Tue Oct 15, 2019 9:25 pm
neufer wrote: ↑Tue Oct 15, 2019 11:58 am
orin stepanek wrote: ↑Tue Oct 15, 2019 11:01 am
I liked the silhouette of the man and area at pages bottom!
He is dwarfed by the enormous size of the Milky Way! Nice photo!
- Yeah...but only because they are not to scale.
So here's the scale: 1 guy, approximately 175 cm, to 1 galactic bulge, approximately 1 kilo parsecs.
The bulge is only about 1.76x10^20 guys wide!
Just as zero is not equal to infinity, everything coming from nothing is illogical.
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neufer
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Post
by neufer » Tue Oct 15, 2019 10:12 pm
BDanielMayfield wrote: ↑Tue Oct 15, 2019 9:25 pm
neufer wrote: ↑Tue Oct 15, 2019 11:58 am
orin stepanek wrote: ↑Tue Oct 15, 2019 11:01 am
I liked the silhouette of the man and area at pages bottom!
He is dwarfed by the enormous size of the Milky Way! Nice photo!
- Yeah...but only because they are not to scale.
So here's the scale: 1 guy, approximately 175 cm, to 1 galactic bulge, approximately 1 kilo parsecs.
The bulge is only about 1.76x10^20 guys wide!
A 1 kpc galactic bulge, itself, is only about 1.76×10
19 [
KFC bulge?] guys wide!
(One parsec ~ 31×10
12 km ~310×10
16 cm)
https://en.wikipedia.org/wiki/Milky_Way wrote:
<<The Sun is 7.7–8.6 kpc from the Galactic Center. In the inner few kpc is a dense concentration of mostly old stars in a roughly spheroidal shape called the bulge. It has been proposed that the Milky Way lacks a bulge formed due to a collision and merger between previous galaxies, and that instead it only has a pseudobulge formed by its central bar. However, confusion in the literature between the (peanut shell)-shaped structure created by instabilities in the bar, versus a possible bulge with an expected half-light radius of 0.5 kpc, abound.>>
Art Neuendorffer
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Ann
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Post
by Ann » Wed Oct 16, 2019 4:22 am
neufer wrote: ↑Tue Oct 15, 2019 10:12 pm
A 1 kpc galactic bulge, itself, is only about 1.76×10
19 [
KFC bulge?] guys wide!
Ann
Color Commentator
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orin stepanek
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Post
by orin stepanek » Wed Oct 16, 2019 11:08 am
neufer wrote: ↑Tue Oct 15, 2019 11:58 am
orin stepanek wrote: ↑Tue Oct 15, 2019 11:01 am
I liked the silhouette of the man and area at pages bottom!
He is dwarfed by the enormous size of the Milky Way! Nice photo!
- Yeah...but only because they are not to scale.
I guess that happens when liberties are taken! I wouldn't know how! Take liberties I mean!
![Mr. Green :mrgreen:](./images/smilies/icon_mrgreen.gif)
Orin
Smile today; tomorrow's another day!