Comments and questions about the
APOD on the main view screen.
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APOD Robot
- Otto Posterman
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by APOD Robot » Fri Mar 10, 2023 5:06 am
Orion and the Running Man
Explanation: Few cosmic vistas excite the imagination like
The Great Nebula in Orion. Visible as a faint
celestial smudge to the naked-eye, the nearest large star-forming region sprawls across
this sharp telescopic image, recorded on a cold January night in dark skies from West Virginia, planet Earth. Also known as
M42, the Orion Nebula's glowing gas surrounds
hot, young stars. About 40 light-years across, it lies at the edge of an immense interstellar
molecular cloud only 1,500 light-years away within the same spiral arm of our Milky Way galaxy as the Sun. Along with dusty bluish reflection nebula
NGC 1977 and friends near the top of the frame, the eye-catching nebulae represent only a small fraction of our
galactic neighborhood's wealth of star-forming material. Within the well-studied stellar nursery, astronomers have also identified what appear to be numerous
infant solar systems.
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jks
- Ensign
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by jks » Fri Mar 10, 2023 5:11 am
I see a cyclist.
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De58te
- Commander
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by De58te » Fri Mar 10, 2023 11:36 am
"astronomers have also identified what appear to be numerous infant solar systems."
I am curious. By definition the solar system are 8 planets and other objects such as asteroids and comets that are orbiting the Sun also called Sol. So how can our Sun produce numerous infant solar systems at least 1,500 light years away? Wouldn't they be called other star infant planetary systems?
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Sa Ji Tario
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by Sa Ji Tario » Fri Mar 10, 2023 12:24 pm
By adoption we call all the systems around a star "solar systems" since the Sun is one of them. We must not be exquisite in calling those whom we recognize by similarity in another way.
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Chris Peterson
- Abominable Snowman
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- Location: Guffey, Colorado, USA
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by Chris Peterson » Fri Mar 10, 2023 3:05 pm
De58te wrote: ↑Fri Mar 10, 2023 11:36 am
"astronomers have also identified what appear to be numerous infant solar systems."
I am curious. By definition the solar system are 8 planets and other objects such as asteroids and comets that are orbiting the Sun also called Sol. So how can our Sun produce numerous infant solar systems at least 1,500 light years away? Wouldn't they be called other star infant planetary systems?
By convention, "solar system" and "planetary system" are largely synonymous. If you turn it into a proper noun (i.e. "Solar System") it unambiguously refers to our own system. "Solar" in general can be used in reference to other stars, just like "geo" can be used in reference other planets (we almost always talk about "martian geology", for example).
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Ann
- 4725 Å
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by Ann » Fri Mar 10, 2023 3:32 pm
Chris Peterson wrote: ↑Fri Mar 10, 2023 3:05 pm
De58te wrote: ↑Fri Mar 10, 2023 11:36 am
"astronomers have also identified what appear to be numerous infant solar systems."
I am curious. By definition the solar system are 8 planets and other objects such as asteroids and comets that are orbiting the Sun also called Sol. So how can our Sun produce numerous infant solar systems at least 1,500 light years away? Wouldn't they be called other star infant planetary systems?
By convention, "solar system" and "planetary system" are largely synonymous. If you turn it into a proper noun (i.e. "Solar System") it unambiguously refers to our own system. "Solar" in general can be used in reference to other stars, just like "geo" can be used in reference other planets (
we almost always talk about "martian geology", for example).
Martian martiology?
Ann
Color Commentator
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Chris Peterson
- Abominable Snowman
- Posts: 18617
- Joined: Wed Jan 31, 2007 11:13 pm
- Location: Guffey, Colorado, USA
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by Chris Peterson » Fri Mar 10, 2023 3:58 pm
Ann wrote: ↑Fri Mar 10, 2023 3:32 pm
Chris Peterson wrote: ↑Fri Mar 10, 2023 3:05 pm
De58te wrote: ↑Fri Mar 10, 2023 11:36 am
"astronomers have also identified what appear to be numerous infant solar systems."
I am curious. By definition the solar system are 8 planets and other objects such as asteroids and comets that are orbiting the Sun also called Sol. So how can our Sun produce numerous infant solar systems at least 1,500 light years away? Wouldn't they be called other star infant planetary systems?
By convention, "solar system" and "planetary system" are largely synonymous. If you turn it into a proper noun (i.e. "Solar System") it unambiguously refers to our own system. "Solar" in general can be used in reference to other stars, just like "geo" can be used in reference other planets (
we almost always talk about "martian geology", for example).
Martian martiology? :mrgreen:
Ann
The term
areology occasionally shows up for martian geology. But most people just stick with geology.
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johnnydeep
- Commodore
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- Joined: Sun Feb 20, 2011 8:57 pm
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by johnnydeep » Fri Mar 10, 2023 10:15 pm
Am I correct in saying the the "Great Nebula in Orion" is merely one small part of the much larger "Orion molecular cloud complex"? The latter being the collection of many different separate nebula in and around the stars making up the Orion asterism?
Last edited by johnnydeep on Sat Mar 11, 2023 1:58 pm, edited 1 time in total.
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"To B̬̻̋̚o̞̮̚̚l̘̲̀᷾d̫͓᷅ͩḷ̯᷁ͮȳ͙᷊͠ Go......Beyond The F͇̤i̙̖e̤̟l̡͓d͈̹s̙͚ We Know."{ʲₒʰₙNYᵈₑᵉₚ}
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Chris Peterson
- Abominable Snowman
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by Chris Peterson » Fri Mar 10, 2023 10:21 pm
johnnydeep wrote: ↑Fri Mar 10, 2023 10:15 pm
Am I correct in saying the the "Great Nebula in Orion" is merely one small part of the much larger "Orion molecular cloud complex"? The latter being the collection of many different separate nebula in and around that stars making up the Orion asterism?
It's kind of like looking at a sky full of clouds and giving one of them a name. It might make you feel good, but it doesn't mean anything to the weather system.
There are lots of examples of big nebular regions where various clumps or shadows within them have been given such designations.
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orin stepanek
- Plutopian
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by orin stepanek » Fri Mar 10, 2023 10:54 pm
NGC1975RunningMan_1024.jpg
I don't even have to let my imagination run wild! It just looks like a
running man!
You do not have the required permissions to view the files attached to this post.
Orin
Smile today; tomorrow's another day!
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AstroLux
- Asternaut
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by AstroLux » Sat Mar 11, 2023 12:56 am
Very sharp image for such a "small" aperture.
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johnnydeep
- Commodore
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- Joined: Sun Feb 20, 2011 8:57 pm
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by johnnydeep » Sat Mar 11, 2023 2:01 pm
Chris Peterson wrote: ↑Fri Mar 10, 2023 10:21 pm
johnnydeep wrote: ↑Fri Mar 10, 2023 10:15 pm
Am I correct in saying the the "Great Nebula in Orion" is merely one small part of the much larger "Orion molecular cloud complex"? The latter being the collection of many different separate nebula in and around the stars making up the Orion asterism?
It's kind of like looking at a sky full of clouds and giving one of them a name. It might make you feel good, but it doesn't mean anything to the weather system.
There are lots of examples of big nebular regions where various clumps or shadows within them have been given such designations.
Go it. Found this nicely annotated image of the entire "complex" with the small "Great" Orion Nebula pointed out, along with things:
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"To B̬̻̋̚o̞̮̚̚l̘̲̀᷾d̫͓᷅ͩḷ̯᷁ͮȳ͙᷊͠ Go......Beyond The F͇̤i̙̖e̤̟l̡͓d͈̹s̙͚ We Know."{ʲₒʰₙNYᵈₑᵉₚ}
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starsurfer
- Stellar Cartographer
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- Joined: Thu Mar 15, 2012 7:25 pm
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by starsurfer » Sat Mar 11, 2023 11:30 pm
I still remember seeing David Malin's AAO photo of this region more than 20 years ago.