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About Digital Art / Professional Premium Member Lorem IpsumMale/Unknown Group :iconanimationteamcedim: AnimationTeamCedim
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HT - LTCV 38 Backstop by Headdie
by Headdie

Very nicely done. At first blush, though, I question the basic assumption behind this work. Large, heavy machines are very vulnerable, ...

Chill mother by iorguDesign

For such a simple piece, this drawing demonstrates an astonishing degree of mastery. Every stroke tells a tale. Nothing could be added ...


Lorem Ipsum
Artist | Professional | Digital Art
I claim to be a professional artist, because I have actually sold a few paintings, though none recently.

Favourite genre of music: anything but rock or grand opera. By "rock" I mean any of various contemporary genres, including rap, heavy metal, techno etc, characterized by raucous monotony. I don't include jazz.
Favourite photographer: Ansel Adams
Favourite style of art: abstract (algorithmic or mathematical), not "abstract"
Operating System: Linux, Ubuntu distribution
MP3 player of choice: vlc
Shell of choice: bash (Bourne Again Shell), Python
Wallpaper of choice: Supernova 1994D in Galaxy NGC 4526 (see webcam)
Favourite cartoon character: Calvin (& Hobbes)

Journal History

That's the title of a favorite miniseries on the Science channel on TV.   It seldom tells me much I didn't already know, but it's less boring than your average sitcom.

One recent episode treats of a surprising property of solar radiation, which I already knew about, but treats it in a little more detail.

One commentator is the well-known astrophysicist and astronomer Alexei Filippenko…  whose course on astronomy I had watched on DVD.  It was good to see him again, but I found his comments on the topic of this show highly objectionable.  He spoke of a photon originating near the center of the sun "wanting" to get to the surface.  Photons don't have desires, they just follow physical law.

The "surprising property" is that a photon originating in a nuclear fusion reaction near the center of the sun takes a very long time to reach the surface, because it is impeded by the extremely dense plasma in the core.   It takes, on average, perhaps 100,000 years to exit the radiative zone, another week or two to propagate up through the convection zone to reach the photosphere -- i.e. what we see as the shining surface of the sun.

The reason it takes so long is that the path a given photon follows is what is known as a "random walk"… .  The photon is emitted from a fusion event, almost immediately absorbed by an electron or proton of the plasma and re-emitted (perhaps as several photons) in a random direction and again almost immediately absorbed, etc.  The path it follows is thus unpredictable, but the "expected" i.e. average distance from the starting point increases uniformly, though very slowly, as time passes.   

Once the photon or its progeny reaches the photosphere, it takes only about 500 seconds -- a little over 8 minutes -- to travel 150 million kilometers, the distance from Sun to Earth.  It will in all likelihood miss the Earth, as Earth is quite small compared to the surface area of a sphere of radius 150 million km.

There is not, as the narrator suggested, any maximum residence time for the photon within the sun.  It is entirely possible that there are some photons that have been bouncing around inside the sun for the whole 4.5 billion years since the sun started to shine, though the percentage in that cohort must be pretty small.




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rattyredemption Featured By Owner Jul 18, 2014
thanks for the fav.
Abstract-scientist Featured By Owner Jul 16, 2014  Hobbyist General Artist
Do you think that this illustration about procrastination is correct? :D…
golem1 Featured By Owner Jun 29, 2014  Professional Digital Artist
Malleni-Stock Featured By Owner Jun 20, 2014  Hobbyist Photographer
:+fav: Thanks a lot ! :blowkiss:
Altschlossfelsen Stock 01 by Malleni-Stock
JoeyBlendhead Featured By Owner Jun 2, 2014  New member Professional Digital Artist
Thanks for the :+fav:
golem1 Featured By Owner May 7, 2014  Professional Digital Artist   note to myself -- line-art to be colored sometime...
golem1 Featured By Owner May 16, 2014  Professional Digital Artist
Project abandoned.  Lineart looks good to the human eye, but to software implementing a "flood-fill" operation, the regions are leaky.
rattyredemption Featured By Owner May 2, 2014
thanks for the fav golem.

i'm currently working on a color cycle version which i hope to upload over the next day or two.
Womblesmack Featured By Owner Apr 10, 2014  Hobbyist Digital Artist
Thanks for the fav, and keep up the good work! :thanks:
golem1 Featured By Owner Apr 25, 2014  Professional Digital Artist
Womblesmack  seems to be no more.  So sorry...
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