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There is a long list of space illustrations which bother me for a variety of reasons, and images of protoplanetary disks are a big offender. While I'm not entirely pleased with my own rendition and may try again at a later point, several key issues are addressed:
1. The star is a point source. You will never see anything but a point source at the scale of planetary disks.
2. Just as you will never see the star as anything but a point, you will also never see any planets. At most, if you were looking in the infrared, you would see another point source many orders of magnitude dimmer than the parent star. It would have its own PSF (point spread function) and that's it. Maybe I could put a dim point source in one of those empty lanes. It's possible. I'll think about it.
3. Because there are no visibly large planets, there are no shadows being cast by them. Even if you were next to a planet, you probably wouldn't see any shadows because "god ray" style shadows depicted in sci-fi movies and art require very specific conditions to occur and probably never happen in space quite like that. Larger scale shadows, sure. We have even seen those recently, but that shadow is cast by perturbations of Earth-orbit-sized structures of the disk itself, not some puny little planet.
Anyway, here are some further thoughts running through my head when illustrating this:
Looking at ALMA and Hubble imagery of real planetary disks, I find them to be astonishingly regular. There are some leftover bumps and blips in Hubble's images, but that's from the star's PSF, not necessarily part of the disk itself. So I assume they are very, very circular and smooth. Something like Saturn's rings.
Understanding basic orbital mechanics and also from studying larger scale disk objects, I guess that they are fluffier as distance from the star increases. I tried to show that. I put some texture in the diffuse foreground ridge and made sure the dust significantly reddened the light passing through it. It might still be too dense at this point, which I imagine to be around 120 AU from the star.
I also imagined an extremely tenuous spherical orb of dust which is denser near the star and virtually nonexistent farther out. You can see it peeking out from under the foreground dust ring. The idea here is that even though this disk is regular now, in the past it had a tumultuous beginning before the angular momentum of the matter swirling around the star settled into its average position like this. Over millions of years this and all dust is dragged into the star, but before that happens, maybe a little is leftover to slowly spiral inward. Just an idea. Possibly totally wrong.
I used Hubble's PSF for the star. I'm a fan. So what. If you noticed that before reading this, then count yourself as either very experienced with Hubble or very perceptive. The PSF was modeled with Tiny Tim.
NASA image captured Feb. 26-28, 2011
The STEREO (Ahead) spacecraft caught a large coronal mass ejection as it roared away from the Sun and out into space in the opposite direction from Earth (Feb. 26-28, 2011). The bright cloud of particles was one of most substantial eruptions that STEREO has observed. The major blast was followed by a much narrower and less bright one. The video clip covers a little more than two days. In these corongraph images, the Sun is blocked out by the red occulting disk and the size of the Sun is represented by the white circle.
Credit: NASA/GSFC/SOHO
NASA Goddard Space Flight Center enables NASA’s mission through four scientific endeavors: Earth Science, Heliophysics, Solar System Exploration, and Astrophysics. Goddard plays a leading role in NASA’s accomplishments by contributing compelling scientific knowledge to advance the Agency’s mission.
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One of the stops Matt and I made this weekend on our downtown Dallas photo walk was Thanks-Giving Square. This shot was taken inside the chapel. The chapel itself is very small and simple until you look up towards the ceiling. As you can see there is a wonderful display of stained glass spiraling upwards. Matt and I spent a lot of time shooting this area - several shots were taken lying on the floor. I'm sure Matt will "knock this out of the park" when he shares his images.
Thanks for looking!
Super Junior won Disk Daesang in GDA ♥
Coagulations our boys , you make me so pround xD
Super Junior kanda , Super Junior jjang ! ♥
ELF hwating :-bd
Hard Disk antigo. Maiores informações no link abaixo.
Thanks for information MindSpigot.
Details of this fixed-head disk see:
www.gizmodo.com/archives/would-that-be-internal-or-extern...
forexrobotrading.com/forex-apocalypse-review
Forex Apocalypse was created by Michael Wright and his team at FX Trading Bots. At the website, there is a video created by Andrew West, who is the head of the development and testing team at FX Trading Bots, which explains what this revolutionary new trading robot can do.
What makes forex robots, or expert advisors, like the Forex Apocalypse so attractive to forex traders or potential forex traders is that they do not require any attention from the user as everything is done on autopilot. In addition, the user does not have to know anything about forex or how to trade forex. This allows users to get setup and trading in a matter of minutes without any learning curve.
Jim Bradshaw takes on a nostalgic joy-ride to days of technology lost with these awesome prints of old disks.
I extended the original cable from the business card USB drive, and routed it through a small piece of plastic, glued in place just inside the opening. This lets out just enough of the cable to plug into a hub or laptop, but prevents me pulling the wires all the way out.
RT @globalelist11: The State of Local #SEO & Where to #focus Now t.co/1krR3W7NW5 #marketing #tech…… t.co/njfkRyLRBJ (via Twitter twitter.com/onkarchoudsh/status/768380100668645377)
the third incarnation of the pinholga's shutter. i got the idea of using a floppy disk from found photograph's this blog entry. this one is customized for the holga though. it was much easier and faster to make than the last version:
1. cut off the part of the disk that has the spring-loaded protector. the disk i got had some soft paper coating inside which i removed as well.
2. make a small cut here and bend the corner up to make a small "handle" that can be used to push the floppy door open. i glued a little piece of foam there to make it less slippery for the cable release.
3. i decided to enlarge the opening as much as possible. i just used a pocket knife to cut away some of the plastic that's blocking part of the opening. this may not be necessary if you decide the existing opening is wide enough for your setup.
4. mount the shutter to the camera. i taped strips of the foam which's self-adhesive on one side, to the edges of the disk so it leaves some room to let the shutter slide open and close. then i just taped the whole thing onto the camera. i added the foam piece on top to block any light that might get to the pinhole when the shutter is closed.
5. you can use the shutter the way it is by just sliding the protector open with your hand, but i decided to use a cable release. i had some ideas about mounting it but in the end i just taped it onto the shutter. we'll see if it lasts or not.
March 13, 2017
A disk of ice forms as droplets of water cling and grow from the base of an icicle.
Brewster, Massachusetts
Cape Cod - USA
Photo by brucetopher
© Bruce Christopher 2017
All Rights Reserved
...always learning - critiques welcome.
Shot with a Canon 7D.
No use without permission.
Please email for usage info.
Proposal 12514-Imaging of Newly-identified Edge-on Protoplanetary Disks in Nearby Star-Forming Regions.
This is a protoplanetary nebula in the constellation Chamaeleon. I couldn't find any more info on it than that. I think a paper has yet to be released.
Hubble Legacy Archive Data set:
SSTGBSJ110824.1-774407 ACS/WFC F606W;CLEAR2L(Green)
SSTGBSJ110824.1-774407 ACS/WFC CLEAR1L;F814W(Red)
Just recently Skoda wheel trims have been very common for me which isn't a bad thing a few days ago i found a Skoda wheel trim i didn't have that was great but its got nothing on this not only haven't i got one of these its also one of my favourite Skoda wheel trims its all complete and the scratches are very light so as it stands now this is by far my favourite find of 2014 :)