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Author Topic:   Coffee House Musing
Tanypteryx
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Posts: 2519
From: Oregon, USA
Joined: 08-27-2006
Member Rating: 5.0


(5)
Message 2 of 26 (885571)
04-18-2021 10:55 PM
Reply to: Message 1 by AZPaul3
04-18-2021 8:57 PM


Re: Astronomy
Adding to everything you listed, the Fermi Gamma-ray Space Telescope in orbit along several others, orbital X-ray observatories, detecting gamma-ray bursts and all sorts of other high energy phenomena. A global network is coordinating observations at a wide range of wavelengths and energies and I think I read that they will also coordinate with the LIGO and Virgo gravitational wave observatories.

All these observatories coordinating to capture rapid transient astronomical events has opened up fertile new areas of research.

Later this year the James Webb Space Telescope will be launched and should blow all our minds.

It even turns out using those advanced computer analysis of the gravitational wave signal reveals lots of additional fine resolution data from what initially looked like noise around the signal.

I am planning to live long enough to see this true golden age of astronomy!


What if Eleanor Roosevelt had wings? -- Monty Python

One important characteristic of a theory is that is has survived repeated attempts to falsify it. Contrary to your understanding, all available evidence confirms it. --Subbie

If evolution is shown to be false, it will be at the hands of things that are true, not made up. --percy

The reason that we have the scientific method is because common sense isn't reliable. -- Taq


This message is a reply to:
 Message 1 by AZPaul3, posted 04-18-2021 8:57 PM AZPaul3 has not yet responded

Replies to this message:
 Message 5 by Phat, posted 04-20-2021 11:53 AM Tanypteryx has responded

  
Tanypteryx
Member
Posts: 2519
From: Oregon, USA
Joined: 08-27-2006
Member Rating: 5.0


(1)
Message 6 of 26 (885602)
04-20-2021 11:55 AM
Reply to: Message 5 by Phat
04-20-2021 11:53 AM


Re: Astronomy
?

What if Eleanor Roosevelt had wings? -- Monty Python

One important characteristic of a theory is that is has survived repeated attempts to falsify it. Contrary to your understanding, all available evidence confirms it. --Subbie

If evolution is shown to be false, it will be at the hands of things that are true, not made up. --percy

The reason that we have the scientific method is because common sense isn't reliable. -- Taq


This message is a reply to:
 Message 5 by Phat, posted 04-20-2021 11:53 AM Phat has not yet responded

  
Tanypteryx
Member
Posts: 2519
From: Oregon, USA
Joined: 08-27-2006
Member Rating: 5.0


Message 10 of 26 (885610)
04-20-2021 2:19 PM
Reply to: Message 7 by dwise1
04-20-2021 12:43 PM


Re: Astronomy
And even before CCDs analog astronomy was rarely about looking through the telescope but rather was all about photography.

In 1975 I bought a Questar telescope that was only 3.5 inches in diameter. It was laughingly small but also considered to be one of the best pieces of engineering to be produced in the 20th century. Visible eye observation is a dream with it. I can see the Giant Red spot and the Cassini Division and non-astrological viewing is mind blowing.

Astrophotography with film was tricky but still fun and I remember people cooling their film with dry ice, but I can't remember why right now. I think it was in the 80's after the Voyager missions that CCD devices started to become available to the amateur astronomers.

The problem with film was always that you had to wait for the film to be developed to see if you got anything. Digital gives you instant feedback on success or failure.

In my own case, I was happy to discover that photography through my Questar with a DSLR produces images that are far superior to my film days with far less fussing around.


What if Eleanor Roosevelt had wings? -- Monty Python

One important characteristic of a theory is that is has survived repeated attempts to falsify it. Contrary to your understanding, all available evidence confirms it. --Subbie

If evolution is shown to be false, it will be at the hands of things that are true, not made up. --percy

The reason that we have the scientific method is because common sense isn't reliable. -- Taq


This message is a reply to:
 Message 7 by dwise1, posted 04-20-2021 12:43 PM dwise1 has not yet responded

  
Tanypteryx
Member
Posts: 2519
From: Oregon, USA
Joined: 08-27-2006
Member Rating: 5.0


(2)
Message 12 of 26 (885614)
04-20-2021 2:44 PM
Reply to: Message 11 by AZPaul3
04-20-2021 2:36 PM


Re: Astronomy
Yes, people, Phat does have a sense of humor.

Well, he shouldn't quit his day job!


What if Eleanor Roosevelt had wings? -- Monty Python

One important characteristic of a theory is that is has survived repeated attempts to falsify it. Contrary to your understanding, all available evidence confirms it. --Subbie

If evolution is shown to be false, it will be at the hands of things that are true, not made up. --percy

The reason that we have the scientific method is because common sense isn't reliable. -- Taq


This message is a reply to:
 Message 11 by AZPaul3, posted 04-20-2021 2:36 PM AZPaul3 has not yet responded

  
Tanypteryx
Member
Posts: 2519
From: Oregon, USA
Joined: 08-27-2006
Member Rating: 5.0


(1)
Message 21 of 26 (886101)
05-05-2021 10:58 PM


Clever Studies in Astrophysics
Today there were several articles in my SciTechDaily news feed about clever, innovative astronomical studies to refine the measurements of the expansion rate of the Universe, plus, is it uniform in every direction? And using gravity waves, specifically created by merging neutron stars, to tell us about all about these stars including the orientation of of the rotating pair.

Gravitational-Wave Scientists Brilliant New Method to Refine the Hubble Constant – The Expansion and Age of the Universe

quote:
A team of international scientists, led by the Galician Institute of High Energy Physics (IGFAE) and the ARC Centre of Excellence for Gravitational Wave Discovery (OzGrav), has proposed a simple and novel method to bring the accuracy of the Hubble constant measurements down to 2%, using a single observation of a pair of merging neutron stars.

I think this was a pretty good article about this study with a lot of good background into the questions we are trying to ask about dark energy that might clues to which questions might increase our understanding of what is observable and how to do that.

Dark Energy Experiment 16 Years in the Making Could Illuminate Origin, Evolution, Fate of Universe

quote:
A map of stars and sound
“HETDEX is very ambitious,” Ciardullo said. “It’s going to observe a million galaxies to map out the structure of the universe going over two-thirds of the way back to the beginning of time. We’re the only ones going out that far to see the dark energy component of the universe and how it’s evolving.”

Both these articles are fairly well written. Occasional articles in their list I would say the best part was the title. Some had whole paragraphs repeated in the same article, but every day I find good articles about studies and findings in the branches of science and technology that interest me. One thing I like about SciTechDaily is a nice list of references for every article.

It's interesting reading while my imaging computer is processing thousands of images every day.

A question just occurred to me, Do gravity waves have an effect like the electromagnetic red-shift from cosmic expansion?

Another question, why is the speed of gravity the speed of light? Is it coincidence or is there an obvious link between gravity and light that I am overlooking?


What if Eleanor Roosevelt had wings? -- Monty Python

One important characteristic of a theory is that is has survived repeated attempts to falsify it. Contrary to your understanding, all available evidence confirms it. --Subbie

If evolution is shown to be false, it will be at the hands of things that are true, not made up. --percy

The reason that we have the scientific method is because common sense isn't reliable. -- Taq


Replies to this message:
 Message 22 by AZPaul3, posted 05-06-2021 5:39 AM Tanypteryx has responded

  
Tanypteryx
Member
Posts: 2519
From: Oregon, USA
Joined: 08-27-2006
Member Rating: 5.0


Message 25 of 26 (886107)
05-06-2021 11:35 AM
Reply to: Message 22 by AZPaul3
05-06-2021 5:39 AM


Re: Clever Studies in Astrophysics
Do gravity waves have an effect like the electromagnetic red-shift from cosmic expansion?

Apparently, yes. Not to be confused with "gravitational redshift" where a photon expends energy to leave the gravity well.

Is it coincidence or is there an obvious link between gravity and light that I am overlooking?

The tie in to Maxwell from Special Relativity shows the "speed of causality" in the equations. GR gives the same constraints on gravity wave propagation as does Maxwell show for EM.

Thanks, good answers!

I'm anticipating the development of the field of gravitational wave astronomy that will open new views of the Universe the same ways that light, radio, X-ray, and Gamma-ray astronomy have. I can imagine the gravity data being used to create visible images of the Universe similar to the images created using various parts of the electromagnetic spectrum. I am disappointed that I will not live long enough to see it developed into a mature branch of astronomy.


What if Eleanor Roosevelt had wings? -- Monty Python

One important characteristic of a theory is that is has survived repeated attempts to falsify it. Contrary to your understanding, all available evidence confirms it. --Subbie

If evolution is shown to be false, it will be at the hands of things that are true, not made up. --percy

The reason that we have the scientific method is because common sense isn't reliable. -- Taq


This message is a reply to:
 Message 22 by AZPaul3, posted 05-06-2021 5:39 AM AZPaul3 has acknowledged this reply

  
Tanypteryx
Member
Posts: 2519
From: Oregon, USA
Joined: 08-27-2006
Member Rating: 5.0


(2)
Message 26 of 26 (886248)
05-11-2021 10:03 PM


Features of Science
One of the positive features of science, that is often unrealized by non-scientists, is the tradition and responsibility to train the next generations of aspiring scientists. This is not just giving students a sampling of the accumulated knowledge previously acquired by scientists in a specific field, but how to engage in science and apply the scientific method to understand observations.

What if Eleanor Roosevelt had wings? -- Monty Python

One important characteristic of a theory is that is has survived repeated attempts to falsify it. Contrary to your understanding, all available evidence confirms it. --Subbie

If evolution is shown to be false, it will be at the hands of things that are true, not made up. --percy

The reason that we have the scientific method is because common sense isn't reliable. -- Taq


  
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