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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.
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This wheat field was recently harvested and the straw baled and stacked in the field. The tractor and disk are parked since summer rains have made the field to wet to work.
East of Elida, Ohio, USA
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.
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.
New disk #commuter
Rolling on @compasscycle bon jon pass
@rideshimano ultegra group set
@velogical_velospeeder rim dynamo
@supernova.design lights
@columbus_official zona tubes
@brooksengland saddle
Blablabla... More will follow
#handmadeinberlin #randonneur #meerglas #steelisreal @commuterbike #commuterbike
Um amigo me passou a idéia e pediu que eu ilustrasse. Bom, vamos ver no que dá haha.
Em breve em votação por aí.
was just finishing up taking a few shots in the snow when suddenly a light appeared in the sky overhead ,these guys beamed down from the disk like something from star trek and started pulling shapes not seen since the 70's disco days.....i guess their home planet must be some kind of boogie wonderland
This is a floppy disk, mainly used for computers and laptops. A floppy disk is a removable magnietic storage medium and was mainly used to store text documents.
“Carry On Collecting” is a project set up by the Museum of Hartlepool to collect objects which represent everyday life in the town and beyond, from the 1950s through to the present day. The collection also attempts to represent the diversity of the people of Hartlepool over the past 60 years
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)
My friend Mike is reattaching the disk to an antique homemade scanning disk TV. Later the motor was rewired by volunteer Adam and we got it going and displaying an image placed in front of the light source. Next an electronic interface will be built so we can transmit TV signals to the unit. The disk was made by National Radio. New England Wireless and Steam Museum, East Greenwich, RI.
you can see the padding disks if you look large, one of Izzy's had fractured and squeezed the spinal cord, having her lose sensation in her legs to where she could not stand or walk, she was just dragging her rear end on the floor. She had what they call deep tissue pain sensation in her rear paws when squeezed hard, she had to have surgery within 24 hours, for an 85% chance at some recovery. So 2 weeks post op now, she had her stitches removed and she is able to walk and even run, but still confined to full rest for the next 2 weeks.
I saw her MRI and I could see how her spinal cord was squeezed very small by the fractured disk...
it takes 4 weeks for the disk to heal and develop scar tissue to where it won't fracture again easily. In that period Izzy has to be kept quiet, relatively motionless, if possible confined to a crate... but, Izzy was never crate trained, she absolutely hates being in there and barks and cries the whole time... she is happiest, curled up in bed under the covers... she even started lying on her back under the covers, snoring... hopefully happier days ahead once again....
please see large...