Starship Asterisk*

TheZuke! wrote: ↑Wed Apr 01, 2020 1:29 pm

richard schumacher wrote: ↑Tue Mar 31, 2020 7:13 pm What is the width of this scene at the distance of the galactic center?

Good question, but the answer is not easy, because time and space are compressed by the black hole,
so while it may "look" to be 2^x furlongs wide, there may be an infinite number of furlongs, barleycorn lengths or centons between any two points.

I am sure our good friend neufer can produce an equation that will lead you toward an approximation.

TheZuke! wrote: ↑Wed Apr 01, 2020 1:29 pm

richard schumacher wrote: ↑Tue Mar 31, 2020 7:13 pm
What is the width of this scene at the distance of the galactic center?

Good question, but the answer is not easy, because time and space are compressed by the black hole,
so while it may "look" to be 2^x furlongs wide, there may be an infinite number of furlongs, barleycorn lengths or centons between any two points.

I am sure our good friend neufer can produce an equation that will lead you toward an approximation.

• One degree at 26,000 light years ~ 450 light years:

https://apod.nasa.gov/apod/ap081110.html wrote:

Our Galaxy's Central Molecular Zone

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Explanation: The central region of our Milky Way Galaxy is a mysterious and complex place. Pictured here in radio and infrared light, the galaxy's central square degree is highlighted in fine detail. The region is known as the Central Molecular Zone. While much of the extended emission is due to dense gas laced with molecules, also seen are emission nebulas lit up by massive young stars, glowing supernova remnants, and the curving Galactic Center Radio Arc in purple. The identity and root cause for many other features remains unknown. Besides a massive black hole named Sgr A*, the Galactic Center houses the galaxy's most active star forming region. This image is not just interesting scientifically. It's esthetic beauty won first prize this year in the AUI/NRAO Image Contest.

richard schumacher wrote: ↑Tue Mar 31, 2020 7:13 pm What is the width of this scene at the distance of the galactic center?

Chris Peterson wrote: ↑Tue Mar 31, 2020 5:29 pm
Parsecs make sense as a derived unit when you're working with something like Gaia data. But definitely- in the big scheme of things a light year is a much better measurement. The only thing that would make it perfect would be replacing "year" with some more universal interval of time- one that anybody in the Universe would recognize. But at least, year ties back to seconds, and seconds depend upon a universal physical property. Quite unlike parsecs, which depend upon an archaic Babylonian number system and the size of Earth's orbit!

• A parsec ~ 2⁵⁷ wavelengths of the 21-centimeter hydrogen line

heehaw wrote: ↑Tue Mar 31, 2020 4:39 pm 26,000 light years away. For a moment I was shocked. Because as a professional astronomer I use parsecs, not light years, so the number briefly stunned me! But! The simple truth of the matter is that 'light year' is a FAR better measure of large astronomical distances, than is silly parsecs. For it, obviously, tells you how long light has to travel to get here! Parsecs tells you - wait for it! - how big Earth's orbit around the Sun would appear from that distant location. Given what we see in that fabulous photograph, there are NO intelligent creatures there to CARE how big Earth's orbit appears to be from their location. Abolish parsecs!

heehaw wrote: ↑Tue Mar 31, 2020 4:39 pm 26,000 light years away. For a moment I was shocked. Because as a professional astronomer I use parsecs, not light years, so the number briefly stunned me! But! The simple truth of the matter is that 'light year' is a FAR better measure of large astronomical distances, than is silly parsecs. For it, obviously, tells you how long light has to travel to get here! Parsecs tells you - wait for it! - how big Earth's orbit around the Sun would appear from that distant location. Given what we see in that fabulous photograph, there are NO intelligent creatures there to CARE how big Earth's orbit appears to be from their location. Abolish parsecs!

Ann wrote: ↑Tue Mar 31, 2020 2:23 pm

jisles wrote: ↑Tue Mar 31, 2020 2:16 pm Strictly, it's Sgr A, not Sag A. The official three-letter abbreviation for the constellation Sagittarius is Sgr, to distinguish it from Sagitta, which is Sge (short for the genitive Sagittae).

Strictly speaking, it is Sgr A*, not Sgr A.

neufer wrote: ↑Tue Mar 31, 2020 1:01 pm

Click to play embedded YouTube video.

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jisles wrote: ↑Tue Mar 31, 2020 2:16 pm Strictly, it's Sgr A, not Sag A. The official three-letter abbreviation for the constellation Sagittarius is Sgr, to distinguish it from Sagitta, which is Sge (short for the genitive Sagittae).

John

Boomer12k wrote: ↑Tue Mar 31, 2020 10:00 am It is actually the other wavelengths we DON'T see...

Space is not empty... it is full of stuff... like Radiation and Emanation of various types of Energy. Many manifestations.

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