Hubble Ultra Deep Field: The oldest image of universe
During 2004, International Space Telescompe focused its lenses to a tiny piece of sky, a piece of hardly the srelative size of a moon crater, something like looking at the saky through a straw. That sky region, at Fornax constellation, looks like a black void, like there was nothing on it.After the observation finished, the result was the called Hubble Ultra Deep Field, the farthest portrait, and at the same time the oldest image of the known universe. On such sky region appeared thousands of galaxies, some of them (the most redded ones), were at about 13 billion light years. That is, they developed "only" 800 million years after the estimated date of universe creation. The light generated by those galaxies that we can see took 13 billion years to reach our planet.
To date, this is the oldest and farthest image of our universe, taking into account that the visible distance or "depth" depends on the time light takes to reach our planet, at a speed of 300.000 Km/second. It’s just imazing and unimaginable notice the vastity for our universe when using "human" scale. It is fascinating to see what hides beyond a small region of sky, such a cuantity and richness of objets.
May be that with the future space telescope James Webb, deep sky snapshots will reach nhigher distance and accuracy. allowing to improve the research and demonstration of the different hypothesis about how could our universe start.
(More information and pictures on Hubblesite)
When we think of computing, we assume that digital information is the paradigm of technological perfection, in comparison to old analog devices, in which the information degrades along the time. This is not correct, and in some cases far from the truth. We trend to consider the digital technology as the most accurate way to transmit, store and reproduce any kind of information, and take for granted that the analog information is inconsistent.
In addition, if we try to store information along the time, like music or movies, apart from the number of bytes to store the information, we will have to decide how many snapshots of the analog signal we will take per time unit. This is also known as sample rate. A sample is a digital image of the analog information occurred in a single moment. So, depending on the number of digital “snapshots” that we take per time unit, the information will be more or less accurate, although it will never be equal to the original signal (that would need a infinite number of samples).But one of the most important problems comes from the D/A and A/D conversion. The devices that convert analog information to digital signals are far from being perfect. They are machines, so they are limited by their construction and the quality of their materials. So, they are actually unable to capture all the available information. For example, a picture is not only its colours, there are other vaguer factors, like brightness, contrast, saturation, hue, angle, etc. that are very hard to accurately summarize as digital 0’s and 1’s. The first problem is that we may lack of the technology capable of detecting such subtle information. 
So, we can see that digital information is more a trick to our senses than perfect information. It’s like cinema, in which we are not watching a continuous film, but about 30 photos a second, creating the impression of motion pictures. The digital information tries to reach the threshold from which our senses cannot detect the sample rate, or the digital accuracy of 0’s and 1’s used. However, reaching that threshold has proved to be more difficult that it seemed. Our senses are extremely precise and perceive a wide range of information, and be able to trick them requires a great technology and knowledge we haven’t acquired by now. The best example of this challenge is a digital movie. It is relatively easy to distinguish between a conventional movie and a digital one. We can even detect any digital image added to a conventional movie. “That is made by computer”, is the typical comment.