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Originally posted by jra
Well like with all technology, as time progresses, our technology improves.
Originally posted by StellarX
They had better technology than what they in fact sent on the missions and if you would go back and read some material on the specifications you would notice that they tended to use 'off the shelf' stuff when they could have used specialized purpose built equipment that would have given far greater resolution and general quality.
Originally posted by MasterJedi
Just a question, but what are the blues and greens I see in some of the pictures, are those actual colors or are they added for distinction?
Originally posted by Soylent Green Is People
I'm not sure which specific shots you mean, but your right - the ones with the blues and greens are usually false-color used because the added contrast makes it easy to distinguish features.
BTW, technically ALL Mars photos (MRO, rovers, etc) and even your digital camera are "false" color. All digital camera sensors are color blind (including NASA's). The camera views the image through different filters, splitting the image into wavelegths of different intensities. These filtered image intensities are then translated by the camera's computer chip and put together into what the computer thinks is the "best guess" is as to the true color.
So in other words, ALL digital camara's "true color" images are just it's computer chips "best guess" at what the color should be.
Originally posted by StellarX
So why have they only started realising such images now? They never needed 'contrast' before?
This is correct but i think your failing to mention that they understand very well how to construct images to best reflect what a human eye under the same conditions would have observed. Why does NASA refuse to consistently give us 'true colour' as we would observe it?
It's not 'guessing' at all ( they have models and they can certainly make it VERY close to accurate ) and i don't like the fact that your suggesting as much here.
Not exactly. Your standard digital cameras use clusters of RGB sensors. They measure the intensity of light at those three specific wavelengths. The light isn't "filtered" before it hits the CCD or CMOS sensor. The sensors are just tuned to produce a charge when they are excited by light of a specific range of wavelengths. The problem with this is that because each pixel is made up of a red, green, and blue value, it actually takes 3 sensors to produce a single pixel in your image. This is how consumer digital cameras work.
Originally posted by Soylent Green Is People
But it is true that ALL digital camera's (even yours) are color blind and their computer chip must make a "determination" of what it "thinks" the true color is based on intensities of filtered light...NOT based on the color of the light. And yes, digital cameras are very good at "determining" the correct color.
Originally posted by jra
Oh I have no doubt that they don't always send the best equipment, but generally that's because that stuff would be too big, heavy, expensive or all of the above.
I believe there are a lot more restrictions when sending things to Mars.
The larger the probe, the more fuel it will need to help slow itself down once at Mars. The larger the probe with more fuel on it, the larger the rocket will have to be to get it up into orbit. With a larger probe, using the best equipment, needing a larger rocket to get off the ground, the more money one is going to have to spend on building it and launching it. See where I'm going with this?
MRO is currently the largest probe to be sent to Mars with the largest camera to be sent to another other Planet. The MRO doesn't even compare to the size of spy satellites. Just look at the size of this
Most of the data volume from Surveyor will be generated by a dual-mode camera called the Mars Orbiter Camera (MOC). This device works like a television camera, but will takes still images instead of motion video. In narrow-angle mode, MOC's black and white, high-resolution telephoto lens will spot Martian rocks and other objects as small as 1.4 meters (4.6 feet) across from orbit. These pictures will be sharp enough to help scientists conduct detailed geological studies without setting foot on the planet.
mars.jpl.nasa.gov...
"It kept coming back that I really needed to be able to see things about this big," Malin said, holding an imaginary loaf of bread; "about 20 centimeters" (8 inches).
But that kind of resolution, typical of the best spy satellites, was out of the question. With declassified technology he could do about 10 times worse; Malin thought that would probably be good enough. The challenge remained the same: design a camera that could pull it off.
Malin turned to Ed Danielson, a soft-spoken Caltech engineer who had helped to create some of the most advanced robotic eyes ever sent into space. Together, they sketched out a design for an instrument that would snare objects about 6.5 feet (2 meters) across -- a 10-fold improvement over the very best handful of Viking Orbiter images. Furthermore, it would be small and lightweight. Surely, they thought, the Science Working Group would welcome it.
"They laughed at us," Malin remembers. "They called it the Garbage Can." Not only did they doubt Malin and Danielson's camera would work, they resented their effort.
www.space.com...
one that was launched in the late '80s (note the little guy in the bottom left for scale). The newer spy satellites are thought to be even larger, weighing as much as 20 tons. Compare that to MRO's weight of 2,180 kg (4,806 lb) with fuel.
My point is, you can't expect them to send the best stuff possible, because it's more than likely not very practical due to size, weight and cost. So like I said, as time goes by technology improves and to add, also gets smaller.
Mars Curse
The high failure rate of America's NASA and other nations' space agencies in their attempts to explore Mars has become known as the Mars Curse. See below for a full list of launch attempts to Mars.
By the spring of 2006, of 37 launch attempts to reach the planet, only 18 have succeeded. Eleven of the missions included attempts to land on the surface, but only six transmitted data once on the surface, and of those only one was non-American (Russian), which lost contact within 20 seconds of landing. Some suggest, mostly in jest, that there is actually some force trying to prevent or punish the exploration of Mars. The Galactic Ghoul is a fictional space monster that consumes Mars probes, a term coined in 1997 by Time Magazine journalist Donald Neff.
en.wikipedia.org...
Originally posted by Soylent Green Is People
I remember viking back in 1976. There were many true color and false images showing contrast that came out of that mission.
The voyager program had false color images of Jupiter, Saturn, Uranus and Neptune that showed some very wild colors. They also had many true-color images.
Most of the mars images I have seen (go on the NASA website) has both true and false color versions of the same image.
"Guess" may have been too strong a word.
But it is true that ALL digital camera's (even yours) are color blind and their computer chip must make a "determination" of what it "thinks" the true color is based on intensities of filtered light...NOT based on the color of the light. And yes, digital cameras are very good at "determining" the correct color.
I'm pretty sure that MARCI (the color imager on the MRO) takes a series of photos of the same location through different filters, then puts those images together. But it, too, must compare the intensities of light through the varios filters, then make an "educated guess" (or as educated as a computer can be) as to the true colors it is imaging.
Originally posted by StellarX
Do you know this or do you assume this and if so why are the most important ( in terms of what would most encourage the tax payer to allocate more funds) scientific instruments so often missing from the original if not final instrument? 'Heavy', 'expensive' and 'too big' are all largely subjective issues as one single instrument that does it's work properly could easily increase NASA funds; it's not that they need more more funds or more missions but that they waste what they they do get on things that no one but the military industrial complex cares about.
A belief that obviously suits your point of view but other than that what in terms of technology can really hols us back if we wanted to do it? You think the NASA budget , when properly employed, could not afford many more scientific missions a year had they cared to focus on that?
Just the same old arguments; military missions putting the space shuttle in orbit to do absolutely mostly nothing of use eats up billions but when it comes to designing equipment for interplanetary exploration everything is 'too difficult' and 'expensive' . I don't buy it and neither should you.
The biggest problem was not any of the things you mentioned ( they could have managed to send a MRO type 'camera' in the 80's) but that they simply did not WANT to send camera's for reason not specified ( "we don't need to" does not count ) i can't prove either way. As if was the first MOC type camera were lost with it's orbiter after someone attempted to sabotage ( not proven but i can tell you about it if your interested) some of the equipment while on the launch pad. I'm not calling hurricane Andrew a saboteur btw.
Now some may believe this high failure rate is just a accident but personally i don't think the 'ghoul' resides on Mars but at NASA HQ. We are seeing the science data we are not because of what they did but in spite of what they did for the last three decades.
Originally posted by jra
What scientific instruments are missing from the finial instrument?
I really don't understand what you're trying to say, sorry.
And a probe being too big/heavy isn't subjective in my opinion. And what exactly does the military have to do with this? (in reference to interplanetary probes).
If NASA had the budget that the 'War on Terror' has, then maybe, but you can only launch probes to Mars every 26 months or so and it's only open for about a month roughly.
It also depends on the rocket, and the payload (its size, mass, etc). The more energy a rocket can put on it's payload, the wider the launch window, thus why interplanetary probes tend to be small and light, so that the rocket can deliver more velocity towards its payload. It all comes down to physics really.
What don't you find believable about those 'same old arguments'? And what military shuttle missions are you referring to? There have been only two as far as I can tell.
And what does that have to do with interplanetary exploration?
"but that they simply did not WANT to send camera's for reason not specified".... huh? And again, I'm not really following what you're saying here in this quote at all, sorry.
Why do you think every mission to another planet should be a 100% success?
Why do you think that when accidents happen that it's a sign of a sabotage or a cover-up or what have you?
We've only been sending probes to other planets for 50 years at most. That's not a long time at all.
Of course there are going to be lots of problems in the beginning. Can you claim to do better?
How good would you be at what is basically throwing a dart at a target millions of miles away?
Out of the 17 missions NASA has sent to Mars, only 5 have failed. I'd say those are still pretty good odds.
Most of the failed missions are from the former USSR. Here's a list of all Mars missions www.seds.org...
Originally posted by StellarX
For nearly thirty years ( since viking) NASA probes lacked the means to establish if there was in fact life on Mars.
Physics i am well aware of as you should know very well by now. These types of statements are not very endearing and just serves to encourage me even more. Fact is payloads can vary greatly based on the models you have provided and the choice of launchers. Why not for that matter use one of the Saturn types which were pretty good for sending men to the Moon? It's just a question of them knowing what they were likely to find.
How good would you be at what is basically throwing a dart at a target millions of miles away?
Go study your physics and repeat that with a straight face.
Out of the 17 missions NASA has sent to Mars, only 5 have failed. I'd say those are still pretty good odds.
If you can get away with being a consistent underachiever i guess that is not bad. How many times did the launch vehicle let them down?