Starship Asterisk*

shaileshs wrote: ↑Mon Nov 13, 2023 5:39 am I've never been fan of such artificial mixture of different compositions with different settings and processing.. What's the purpose ? Why make something appear so incorrect from physics and reality perspective.. it's not like we are here at APOD to watch a Sci-fi movie with CGI effects.. It's images like these, can be misused and misunderstood for various reasons. Today, at least the creator is accepting that they have mixed 2 compositions, tomorrow, with AI, it'd be absolutely misleading (and be part of "misinformation" or "disinformation"). No ? Sorry, just my personal opinion. Others can agree/disagree as they like.

shaileshs wrote: ↑Mon Nov 13, 2023 5:39 am I've never been fan of such artificial mixture of different compositions with different settings and processing.. What's the purpose ? Why make something appear so incorrect from physics and reality perspective.. it's not like we are here at APOD to watch a Sci-fi movie with CGI effects.. It's images like these, can be misused and misunderstood for various reasons. Today, at least the creator is accepting that they have mixed 2 compositions, tomorrow, with AI, it'd be absolutely misleading (and be part of "misinformation" or "disinformation"). No ? Sorry, just my personal opinion. Others can agree/disagree as they like.

shaileshs wrote: ↑Mon Nov 13, 2023 5:39 am I've never been fan of such artificial mixture of different compositions with different settings and processing.. What's the purpose ? Why make something appear so incorrect from physics and reality perspective.. it's not like we are here at APOD to watch a Sci-fi movie with CGI effects.. It's images like these, can be misused and misunderstood for various reasons. Today, at least the creator is accepting that they have mixed 2 compositions, tomorrow, with AI, it'd be absolutely misleading (and be part of "misinformation" or "disinformation"). No ? Sorry, just my personal opinion. Others can agree/disagree as they like.

I took this image over a year ago, on 12 January 2022. I used a Samyang 135 mm lens @ f/2.8 and a ZWO ASI 2600MC camera (gain 100, bin 1, -10 °C). The setup was mounted on an SW AZGTi mount operating in equatorial mode and was controlled by ASIAIR Pro. I had only about 20 minutes to capture the Andromeda Galaxy before it hid behind the mountain. The data (40x30 s) was collected between 22:40 and 23:02 UT. Once captured, I turned off the tracking and proceeded with capturing the foreground (10x10 s). The foreground mountain was conveniently illuminated by a waxing gibbous moon that night. Both the background sky and the foreground images were calibrated, stacked, and processed in PixInsight, followed by blending and final polishing in Adobe Photoshop. The final image was resized to 40% and cropped.

In astrophysics, the virial mass is the mass of a gravitationally bound astrophysical system, assuming the virial theorem applies. In the context of galaxy formation and dark matter halos, the virial mass is defined as the mass enclosed within the virial radius r_vir of a gravitationally bound system, a radius within which the system obeys the virial theorem. The virial radius is determined using a "top-hat" model. A spherical "top hat" density perturbation destined to become a galaxy begins to expand, but the expansion is halted and reversed due to the mass collapsing under gravity until the sphere reaches equilibrium – it is said to be virialized. Within this radius, the sphere obeys the virial theorem which says that the average kinetic energy is equal to minus one half times the average potential energy, ⟨T⟩ = ½ ⟨U⟩, and this radius defines the virial radius.

johnnydeep wrote: ↑Mon Nov 13, 2023 3:28 pm For the record, this is the description from the photographer at Astrobin

I took this image over a year ago, on 12 January 2022. I used a Samyang 135 mm lens @ f/2.8 and a ZWO ASI 2600MC camera (gain 100, bin 1, -10 °C). The setup was mounted on an SW AZGTi mount operating in equatorial mode and was controlled by ASIAIR Pro. I had only about 20 minutes to capture the Andromeda Galaxy before it hid behind the mountain. The data (40x30 s) was collected between 22:40 and 23:02 UT. Once captured, I turned off the tracking and proceeded with capturing the foreground (10x10 s). The foreground mountain was conveniently illuminated by a waxing gibbous moon that night. Both the background sky and the foreground images were calibrated, stacked, and processed in PixInsight, followed by blending and final polishing in Adobe Photoshop. The final image was resized to 40% and cropped.

So, I gather that Andromeda really would appear this large in the sky if our eyes were sensitive enough to detect its full extent.

Chris Peterson wrote: ↑Mon Nov 13, 2023 3:55 pm

johnnydeep wrote: ↑Mon Nov 13, 2023 3:28 pm For the record, this is the description from the photographer at Astrobin

I took this image over a year ago, on 12 January 2022. I used a Samyang 135 mm lens @ f/2.8 and a ZWO ASI 2600MC camera (gain 100, bin 1, -10 °C). The setup was mounted on an SW AZGTi mount operating in equatorial mode and was controlled by ASIAIR Pro. I had only about 20 minutes to capture the Andromeda Galaxy before it hid behind the mountain. The data (40x30 s) was collected between 22:40 and 23:02 UT. Once captured, I turned off the tracking and proceeded with capturing the foreground (10x10 s). The foreground mountain was conveniently illuminated by a waxing gibbous moon that night. Both the background sky and the foreground images were calibrated, stacked, and processed in PixInsight, followed by blending and final polishing in Adobe Photoshop. The final image was resized to 40% and cropped.

So, I gather that Andromeda really would appear this large in the sky if our eyes were sensitive enough to detect its full extent.

There's no way of comparing how Andromeda would look to our eyes and how it looks in an image. Its apparent size in the image depends upon the distance between the camera and the mountains. By changing that, Andromeda could appear the size of a boulder on the mountaintop or the size of the entire mountain range.

Maxedwell7 wrote: ↑Mon Nov 13, 2023 2:03 pm IF we had a telescope that was powerful enough to see all the way into the Andromeda galaxy, and powerful enough to zoom into a planet that harbored some type of life, would we be seeing images from 2 million years ago or current?

johnnydeep wrote: ↑Mon Nov 13, 2023 4:20 pm

Chris Peterson wrote: ↑Mon Nov 13, 2023 3:55 pm

johnnydeep wrote: ↑Mon Nov 13, 2023 3:28 pm For the record, this is the description from the photographer at Astrobin



So, I gather that Andromeda really would appear this large in the sky if our eyes were sensitive enough to detect its full extent.

There's no way of comparing how Andromeda would look to our eyes and how it looks in an image. Its apparent size in the image depends upon the distance between the camera and the mountains. By changing that, Andromeda could appear the size of a boulder on the mountaintop or the size of the entire mountain range.

Ok, but wouldn't it look the same if our eyes were positioned exactly where the camera was (and were just as sensitive)?

shaileshs wrote: ↑Mon Nov 13, 2023 4:47 pm

Maxedwell7 wrote: ↑Mon Nov 13, 2023 2:03 pm IF we had a telescope that was powerful enough to see all the way into the Andromeda galaxy, and powerful enough to zoom into a planet that harbored some type of life, would we be seeing images from 2 million years ago or current?

From over 2 million years ago. What we "see" is what light shows us and light emitted from stars/planets/life on planets in same galaxy is all same. It takes 2+ millions years for light to reach us from there. So, no one knows what happened later (during those 2+ million years when light was travelling to us) .. whether life on planet lived long or even if galaxy is still there or not.. we'll come to know each passing day.. for next 2+ million years.. if we (our future generation is still around)

VictorBorun wrote: ↑Mon Nov 13, 2023 5:37 pm

shaileshs wrote: ↑Mon Nov 13, 2023 4:47 pm

Maxedwell7 wrote: ↑Mon Nov 13, 2023 2:03 pm IF we had a telescope that was powerful enough to see all the way into the Andromeda galaxy, and powerful enough to zoom into a planet that harbored some type of life, would we be seeing images from 2 million years ago or current?

From over 2 million years ago. What we "see" is what light shows us and light emitted from stars/planets/life on planets in same galaxy is all same. It takes 2+ millions years for light to reach us from there. So, no one knows what happened later (during those 2+ million years when light was travelling to us) .. whether life on planet lived long or even if galaxy is still there or not.. we'll come to know each passing day.. for next 2+ million years.. if we (our future generation is still around)

Some parts of Andromeda's disk are more distant from us than others.
We maybe get a beam message THE EMPIRE FLEET IS AFTER YOU EARTHLINGS from a distant part and, in the same time, another beam message SORRY FOR THE BASTARDS WHO MANAGED TO SEND EMPTY THREATS BEFORE THE DEMOCRACY PREVAILED

Chris Peterson wrote: ↑Mon Nov 13, 2023 5:00 pm

johnnydeep wrote: ↑Mon Nov 13, 2023 4:20 pm

Chris Peterson wrote: ↑Mon Nov 13, 2023 3:55 pm

There's no way of comparing how Andromeda would look to our eyes and how it looks in an image. Its apparent size in the image depends upon the distance between the camera and the mountains. By changing that, Andromeda could appear the size of a boulder on the mountaintop or the size of the entire mountain range.

Ok, but wouldn't it look the same if our eyes were positioned exactly where the camera was (and were just as sensitive)?

Not really. The field here is 6.8 degrees wide. So basically, this is what it would look like if you were using binoculars from the camera location and had super sensitive eyes.

Rainer Beck wrote: ↑Wed Nov 15, 2023 8:13 pm Good news: Andromeda will NOT collide with our Galaxy. A few years ago, the GAIA space observatory measured proper motions of many stars in M31 and found that is does not head exactly towards us. Instead, M31 and our Galaxy will start dancing around each other in a few billion years. Much nicer!

Astronomers have known for some time that the Milky Way and the Andromeda galaxies will collide on some future date. The best guess for that rendezvous has been about 3.75 billion years from now.

But now a new study based on Data Release 2 from the ESA's Gaia mission is bringing some clarity to this future collision.

...

The study also revealed more of what's in store for the Milky Way and Andromeda. Rather than a collision (which is more accurately called a tidal interaction since no stars or planets were ever likely to collide), there's going to be more of a glancing blow.

And rather than taking place in about 3.75 billion years, it'll be in about 4.5 billion years. Phew!

The new paper, and the new data from Gaia, also shed some light on how galaxies like Andromeda and Triangulum form and evolve.

The new measurements imply that the M31 orbit toward the MW is less radial than implied by the HST measurement alone. This too is in good agreement with cosmological expectations. This implies that the future collision with the MW will happen somewhat later, and with larger pericenter, than previously inferred

Rainer Beck wrote: ↑Wed Nov 15, 2023 8:13 pm Good news: Andromeda will NOT collide with our Galaxy. A few years ago, the GAIA space observatory measured proper motions of many stars in M31 and found that is does not head exactly towards us. Instead, M31 and our Galaxy will start dancing around each other in a few billion years. Much nicer!

johnnydeep wrote: ↑Mon Nov 13, 2023 7:00 pm

VictorBorun wrote: ↑Mon Nov 13, 2023 5:37 pm

shaileshs wrote: ↑Mon Nov 13, 2023 4:47 pm

From over 2 million years ago. What we "see" is what light shows us and light emitted from stars/planets/life on planets in same galaxy is all same. It takes 2+ millions years for light to reach us from there. So, no one knows what happened later (during those 2+ million years when light was travelling to us) .. whether life on planet lived long or even if galaxy is still there or not.. we'll come to know each passing day.. for next 2+ million years.. if we (our future generation is still around)

Some parts of Andromeda's disk are more distant from us than others.
We maybe get a beam message THE EMPIRE FLEET IS AFTER YOU EARTHLINGS from a distant part and, in the same time, another beam message SORRY FOR THE BASTARDS WHO MANAGED TO SEND EMPTY THREATS BEFORE THE DEMOCRACY PREVAILED

But that second message would still always arrive on Earth after the first one. The two events' relative sequence in time won't change. But maybe I'm not understanding what you meant.

VictorBorun wrote: ↑Sat Dec 09, 2023 8:54 am

johnnydeep wrote: ↑Mon Nov 13, 2023 7:00 pm

VictorBorun wrote: ↑Mon Nov 13, 2023 5:37 pm

Some parts of Andromeda's disk are more distant from us than others.
We maybe get a beam message THE EMPIRE FLEET IS AFTER YOU EARTHLINGS from a distant part and, in the same time, another beam message SORRY FOR THE BASTARDS WHO MANAGED TO SEND EMPTY THREATS BEFORE THE DEMOCRACY PREVAILED

But that second message would still always arrive on Earth after the first one. The two events' relative sequence in time won't change. But maybe I'm not understanding what you meant.

honestly I failed to remember what I was trying to say.
Now I think a closer point of Andromeda may send a message 100 kiloyears later and we get it on the same day