Planet Four Talk
Half a 3-D image. (So 1.5-D perhaps?) 😃
Need my 3-D specs for this one. 😃
I'm guessing you're correct. Your best guess is good enough so keep on keeping on. 😉
#boulders on crazy paving #spiders
A kind of #blue speckled #lace-terrain - Very nice.
Nice big #spider and a suggestion of #linear-venting
It's a glitch in one of the HiRise colour filters. I tend to mark these as #glitch in the comment box.
Others have used the blotch tool for the bottom one. I'd say it was a blotch.
Blotches rather than fans. Not shadows.
I guess there will be strong gusts and light breezes (or no breeze at all) during the fan/blotch forming season.
Linear venting. Always difficult. A row of fans with overlapping tails is as close as you'll get. Do what you can is the motto. 😉
Planet Four images are from South Polar regions. Lots of CO2 frost and ice. Follow 'View HIRISE image' link (below image) for more info.
The blue is believed to be CO2 frost. All the images on Planet Four are from the South Polar regions.
It's a glitch in the camera. Data loss in one of the colour filters.
What do you want help with? Mit was willst du helfen?
Hi @charlymaya The blue areas are frost. In your image frost fans have formed first, then dark dust fans on top. Great image. Cheers.
The gaps indicate that the wind direction has changed.
The blue areas are frost.
Site work for Stargazing Live may be having an effect. If problem persists then drop a line to Meg via the Help board. Good Luck. 😃
#spiders An interesting dendritic selection.
Yuk ... Not a nice picture.
#spiders Love this sort of landscape.
That is indeed a lovely image. It has a certain 3-D appearance to my eye as if we're looking at wind swept dunes - which I'm sure we're not.
Sunlight coming from bottom-right, so you're seeing channels not ridges.
#ice #spider network
#spiders eventually making #lace terrain?
Very nice #spiders
@nobus - No, not a mistake. They probably are lines of fans. Whatever you think is best, that's what you should mark. 😃
Hi. The white lines are 'spider' channels carved into the surface by erosion. The white stuff itself is frost/ice.
I'd suggest marking a network of blotches. Even if you only mark the larger blotches I'm sure it would be useful.
Interesting. Possibly #boulders
These are blotches. Mark them with the blotch tool on the classifying page. They are made by dust settling on the co2 ice.
Hello YD. The images come from different regions around the south pole of Mars. Some areas have darker rock than others.
Hi monalsingh. Sunlight comes in at bottom right of image, so the left side of the channels are bright and the right side are in shadow. 😉
Hello ZHOUYANGJIE. The blue stuff is carbon dioxide ice and frost.
Hi Gnawledge. We've seen a few of these. Most likely a bad pixel in the camera.
#boulders - Like buses, none for ages then two together!
#boulders - Not seen any for a while. 😉
#lace terrain. Not seen any of this for a while.
#frost (?) in spiders
#ugly - Sorry, but there it is...
#boulders and bumps.
The lines are channels in the surface. Sunlight from bottom right of image, so left side of channel lit up and right side in shadow.
Hi dfaxon. Far as I know, this is the only example of a 'space chimney' that's been caught on camera. Might be others, so keep looking. 😃
These are 'yardangs', formed by wind erosion.
It means that there is a lot of dust covering the icy surface. It's a giant blotch. The white specks is where the ice shows through.
These are 'yardangs'. Formed by strong winds eroding the surface.
Not all images show fans / blotches. They only appear in certain places at certain times. Your clicks help to find out when and where. 😉
That's right. So we would mark these as blotches.
Hi. Probably a bad pixel on the camera.
Yes to camera bug. I mark these as #glitch - Others mark them as #filter 😃
Known as 'Frost Fans'. See Pete's comment below (before your previous comment) for a nice explanation.
Yes. Might be spread due to shifting wind, or multiple fans from one source overlapping, but I'd mark it as a single fan. Cheers. 😃
Well spotted, but no. It's dark shadow in deep 'spider' channels. Just like the slugs above centre. 😃
#glitch. Horizontal for a change. More glitch images than usual today.
blotchy black #glitch
#blue remnants in a rather nice looking spider.
Have met this problem before. Seems to come and go. If persistent, post it in 'Interface Help'. Good luck. 😃
Yes. Probably a glitch.
They are frost-fans, rather than dark dust-fans. Hope that helps. 😃
What a beautiful dendritic #spider
Right hand edge, about third way up. Marked as 'interersting'.
We've seen several of these. Unknown for sure. Might be a spot of leftover ice, but some folks say they are camera glitches. What say you?
Yes. These are blue frost fans.
#yardangs - Forming or fading?
#yardangs - forming or fading? Hmm...
Hairline cracks. Some with 'dust stains'.
The stripes are known as yardangs. They are caused by wind erosion.
They are channels (not ridges) but not formed by rivers. Nicknamed 'spiders' - learn more at http://www.planetfour.org/#/about
Well spotted! I've no idea what it is.
Good question. Sunlight comes from bottom-right of images so shadows of raised objects (if present) will be on top-left of objects.
They are channels carved into the surface (nick-named 'spiders'). Learn more here: http://www.planetfour.org/#/about 😃
Hi garryace. Mark as many as you possibly can. Best if you could mark them all, or at least most of them, but whatever you do will help. 😉
They are wind-blown erosion features known as yardangs.
Is this the Martian Flag? 😃
I know Mars is called the red planet, but this is ridiculous 😃
One of many reasons that I'm a 'big fan' of Planet Four
Could be boulders. People usually mark these types of images as #hard2see. Can't think why! 😃
More like stains than blotches (?)
A glitch in the camera filters. There are occasional images like this.
Well spotted. Definate bumps that might well be boulders.
Possibly remnants of winter icelayer mixed with dust.
#boulders with #blotches and fans
#boulders - unusual background.
#Lace in the making?
Looks like a thin spider following the outline of the wide spider on left of image.
#boulder looking lonely
#boulders on ridge
#boulders in spider
#blue blans and fotches 😉
#boulders with blotches
#frost along ridge. Great image.
Hi Angi. Good to see you again. This is lace terrain: APF00009je You have spiders with 'tortuosity' (What a great word) 😉
#boulders in blotches
I'll take your word Pete. Can't see them myself, but maybe if I clean my glasses ... 😃
Hi debbienas. They are 'spiders'. Channels carved into the surface. Sun from the bottom right of image lights up the left of the channel.
Boulders. Often, not always, associated with venting of dust like those in your image. See 'Boulders' on Citizen Science discussion board.
I don't know the answer to that. Whatever it is, it's pretty weird. Yet another martian mystery. Good find.
Fat bodies. We've nicknamed these as 'bugs'. They get much bigger than this. 😃
We've nicknamed it 'rustgrust'. Lovely image. 😉
Sunlight comes from bottom right. We've nicknamed these objects as 'bugs'. They're depressions.
Pete collects these for his study here: http://talk.planetfour.org/#/boards/BPF0000008/discussions/DPF0000g89 Cheers.
Use 'View HiRise Image' link below the image to see wider area. Use JPEG greyscale links (down the page) for even wider view.
Yes indeed. I can also see a curved line from bottom spot making egg shape round to spot in bottom right corner. Fills about half the image.
That would be a fire-breathing dinosaur, right? 😃
I make that 0.42km x 0.32km. What say you? 😃
Great question Justin. No-one knows the answer yet. It's one of the things the P4 scientists are trying to find out using your markings.
Hi Pete. Interesting you say 'deep', rather than wide. Be good to get some accurate data on this, methinks.
Hi. Nice to see you here. It's a blotch. The others are fans. The two big fans bottom right are a bit blotchy, but definately fans. Cheers.
Smallest object seen ~1m. These are possible boulders (a few metres). Sunlight comes from bottom-right. See 'Boulders' in Citizen Science.
I have a theory here: http://talk.planetfour.org/#/boards/BPF0000002/discussions/DPF0000dfz Cheers.
Difficult indeed. I'd say all blotches, no fans and I'd have just marked as many blotches as I could. I'd probably miss out the tiny specks.
It's a lump, not a crater. Sunlight comes from bottom right, so right side of lump lit up with left side in shade. 😃
The blue frost fans are discussed here (about halfway down): http://blog.planetfour.org/2014/09/10/a-summary-of-a-p4-summer/
Nice find. Looks like remnants of what we call 'linear venting'.
...or something you might throw up after being 'plastered' !! 😦
Tricky. I think I'd have marked it as a blotch, but as long as you marked it as something your efforts will be appreciated.
Nice find. And as you say, a very different kind of 'spidering' than those we usually see.
The red strip across the top is a 'glitch' in the data. The brown terrain is nearer to the true colour of the surface here.
Known as a 'frost fan'. Not fully understood yet.
Well spotted. Fans definately following the bright line.
Mars is never ordinary, just weird 😃 Area looks bumpy/bouldery to me. Frost reflecting sunlight probably causing the glowing appearance.
The science team are working on this (and other) questions. Could be quite high in a gentle breeze, but probably less so in a high wind.
So it's a blan or a fotch then, eh? 😉
Tricky. Could be either, or both! Which did you choose?
Yes. It's a camera 'glitch'. Well spotted.
That's a great find. Really interesting image.
Right again, Anambas 😃
Well spotted !! This type of surface is called 'Lace Terrain'.
Yep. Gulleys (we call them 'spider' channels). Sunlight comes in from lower right in these images. Sorry, no volcanoes here.
Pete: I think there are several spiders here, but they're mainly dusty. Maybe frost in the white one (?)
Nice find. Perhaps they're relatively young?
The green bits are camera glitches.
These are pits/depressions. Sunlight from bottom right lights up the left hand side of pits, with right side in shadow.
There are no fans/blotches here so nothing mark. The image shows 'spider' channels (depressions) not ridges. Sun comes from bottom right.
#boulders / iceballs ?
#boulders or small 'limpets'?
Pleasure. Sunlight comes in from bottom right of these images, so channels can look like ridges and vice verca. I still get caught out !!
The white is frost/ice lying in the 'spider' channels. The vein-like strands are channels 'carved' into the surface of Mars.
There was definately a 'major' glitch when the image was captured. Rare to see this - and you got two of them !! 😃
These are camera 'glitches'. Loss of data on one or more of the filters as the camera makes its pass.
Hmm, I see boulders. Bright on the right, left side in shadow (?)
All spiders go down. They are channels carved in the surface. Sunlight comes from bottom right of images lighting the left side of channels.
A fine example of 'spider' channels. Interesting indeed.
When the fans formed the wind was blowing in one direction. Some images show multi-directional fans, when the wind changes direction.
The colour is probably due to frost. Colours are not always (if ever) true colours, so not good for mineral identification.
This blog entry will help you: http://blog.planetfour.org/2013/01/15/you-have-asked/
Formed by the wind. This explains all: http://blog.planetfour.org/2013/01/15/you-have-asked/
It's a field of blotches. You could mark it #blotchfield.
It's a hole. Nick-named 'Space Chimney'. More details here: http://blog.planetfour.org/2013/04/03/space-chimney-re-imaged/
'Inca City'. Wonderful. I gathered some nice images in my mini-study of the area. (On 'Citizen Science' board).
HiRise image suggests to me eroding top surface (smooth) exposing patterned ground (polygons) (?)
Yep. Boulders they be. But we still don't know much about them.
OOPS. Sorry. I'm still in MRO Viewer mode. Forget (and forgive) last comment 😛 Sunlight in from bottom right, so channels they must be.
HiRise says Caterpillar Dunes. With sunlight from top left that makes them 'bumps'. You do get excited at a good boulder though, eh? 😃
I'll bet you are. Glad I didn't get that one. 😉
Take a look at the HiRise image (the RGB non-map projected) and you can see that your fans above come from cracked ice. It's a great image.
That's right. Just mark fans/blotches. If the shadows are cast by something interesting, we'd love to see it 'on the boards'. Cheers.
Yes it does. The 'gold-dust' effect is also interesting. Don't think a gold-digger, or a vegetarian, would have any luck on Mars though. 😃
I see what you're saying. The pinkish bits either side of centre are nice too.
The boulders are above ground. Sunlight is coming in from bottom right of the image, so the boulders get lit up and shine - like lights 😉
We've nick-named this as 'linear venting'. Could be cracks in the ice, or in the martian surface, that make the vents line up.
It does indeed. Patchy frost probably. Some of the bright dots are definately boulders - which are a mystery in their own right. 😃
Yes, they're fans. Scale and resolution constant (rare exceptions). Why are fans small? Don't know. Maybe start a new Help discussion?
Strange indeed, but yes, it's Mars. Don't forget to use the 'View HiRise Image' link to see these images in a wider context.
#fossil crater. #boulders.
Good find! Those are some mighty big 'spider' channels you have there. Don't usually see them this big.
With my eyes I can only see about six. Hope you did better than that! 😃
Nice one. It's not difficult to see where the connections will be made either. Path of least resistance?
It's a glitch in the HiRise camera. You'll see more, but not too many. Cheers.
There's been several of these 'circles' spotted in this type of terrain. Not fully explained as yet, so far as I know.
Wassock has a couple of 'multi-fan' discussions on the go. The 'Bendy Winds' in the HiRise Images discussions is well worth a look.
Yep. And the fans are very wide too...
Referred to as 'linear venting' features in the discussions.. My own method is to mark them as blotches even though they're probably fans.
My guess is these spiders are trying to 'grow' into this http://www.planetfour.org/subjects/standard/50e7411e5e2ed2124000318f.jpg
Domes or depressions please? I've tried rotating the image but still not sure.
Isolated blue dot.
Spiders on the right - Potential spiders on the left?
Suggestion of circular feature with 'diameter'.
Possible 'fault lines' (left and centre)?