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Author Topic:   Coffee House Musing
AZPaul3
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Posts: 5838
From: Phoenix
Joined: 11-06-2006
Member Rating: 4.4


(2)
Message 1 of 26 (885570)
04-18-2021 8:57 PM


Astronomy
No debate topic, really, just an observation I think is significant.

In the last 20 years there has been a major shift in the conduct of astronomy. Not just the larger more powerful scopes on both land and in space that have become operational, which provide much deeper clearer views of the cosmos across most all of the EM spectrum, but, more significant is the way they have come operational.

Modern viewing on telescopes is digital, not optical. CCDs (charge-coupled devices) and other gizmos convert what the astronomer would have seen in optical to digital data stored in computer databases. The beauty is that these gizmos don’t just blip a signal when they are hit by a photon but, these days, they record the frequency, energy, amplitude, polarity, birth date and social security number of every photon they see. Ok, maybe not those last two.

Every major telescope on the planet has gone digital. Gone are the days when you had to request physical time on the scope then travel to the scope to sit in a freezing dome all night taking pretty pictures on emulsion.

You can still request time for specific views but, better yet, if an adequate view is already in the database you don’t have to wait. The astronomer then writes code, or more usual they have their grad students write most of it, to extract the data from the database and they code more programs to analyze and display the data and still more code to build simulations using the data. Collaborations are now going on to catalogue all the world’s scope’s databases into a database of databases available on-line. Download the few hundred gigabytes you want and start programming.

By scientific requirement specs and by international agreement, with a few exceptions, all the new scopes being built and planned will be required to dump their data eventually into databases available on-line without charge to the world. Astronomer/programmers, amateur/astronomer/programmers, home nutjob/astronomer/programmers, all have access. Vera Rubin, a monster scope being built in Chile, is expected to dump into their database, don’t hold me to this precise number, more than few terabytes of data each day. Even the new Chinese super huge FAST telescope (an Arecibo replacement) will participate in a limited way.

Astronomy has become computer programming and data mining. After the math, programming is the most required skill to be an astronomer. If you can program, astronomy is now a stay-at-home cottage industry open to anyone with internet access.

Imagine what we are going to find.

Edited by AZPaul3, : No reason given.

Edited by AZPaul3, : title


Eschew obfuscation. Habituate elucidation.

Replies to this message:
 Message 2 by Tanypteryx, posted 04-18-2021 10:55 PM AZPaul3 has not yet responded
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AZPaul3
Member
Posts: 5838
From: Phoenix
Joined: 11-06-2006
Member Rating: 4.4


Message 11 of 26 (885612)
04-20-2021 2:36 PM
Reply to: Message 5 by Phat
04-20-2021 11:53 AM


Re: Astronomy
This whole math thing is no replacement for woo.

Good one, Phat.

But, someone's going to think you're serious. Prepare for the rumble.

Yes, people, Phat does have a sense of humor.


Eschew obfuscation. Habituate elucidation.

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

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AZPaul3
Member
Posts: 5838
From: Phoenix
Joined: 11-06-2006
Member Rating: 4.4


Message 13 of 26 (885615)
04-20-2021 2:57 PM
Reply to: Message 9 by dwise1
04-20-2021 2:09 PM


Re: Astronomy
All I could think of was that accidental pun and so chose "DWise1" as my screen name.

I like my theory of your name better. You were trying to warn people of both the intellect and humor headed their way.


Eschew obfuscation. Habituate elucidation.

This message is a reply to:
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AZPaul3
Member
Posts: 5838
From: Phoenix
Joined: 11-06-2006
Member Rating: 4.4


(2)
Message 22 of 26 (886103)
05-06-2021 5:39 AM
Reply to: Message 21 by Tanypteryx
05-05-2021 10:58 PM


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.

https://arxiv.org/pdf/1312.1862v2.pdf

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.

Edited by AZPaul3, : No reason given.

Edited by AZPaul3, : No reason given.


Eschew obfuscation. Habituate elucidation.

This message is a reply to:
 Message 21 by Tanypteryx, posted 05-05-2021 10:58 PM Tanypteryx has responded

Replies to this message:
 Message 25 by Tanypteryx, posted 05-06-2021 11:35 AM AZPaul3 has acknowledged this reply

  
AZPaul3
Member
Posts: 5838
From: Phoenix
Joined: 11-06-2006
Member Rating: 4.4


Message 24 of 26 (886106)
05-06-2021 6:43 AM
Reply to: Message 23 by jar
05-06-2021 6:06 AM


Re: SN15
That's one in a row.

Eschew obfuscation. Habituate elucidation.

This message is a reply to:
 Message 23 by jar, posted 05-06-2021 6:06 AM jar has not yet responded

  
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