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'Blue Peter' technology coul lead to advances in space technology

Thursday, 06 September 2007

A team of astronomers led by Cambridge University have taken pictures of the stars that are sharper than anything produced by the Hubble telescope And they used what they called ‘Blue Peter’ technology to make a breakthrough that could lead to the improved performance of some of the world’s largest space telescopes. The potential advances in space research could be immeasurable and the savings on technology updates run into billions of dollars as a result of the technique, which is known as ‘lucky imaging’. As a benchmark, it reportedly cost NASA an estimated $2.1 billion to put the Hubble space telescope into orbit. Seasoned space researchers around the world were star struck by this week’s galactic achievement by the enterprising earthlings from the University of Cambridge and colleagues at the California Institute of Technology (Caltech) Using lucky imaging, they took the most detailed pictures of stars and nebulae ever produced – using a camera based on the ground. Images from ground-based telescopes are usually blurred by the Earth’s atmosphere – the same effect that makes the stars appear to twinkle when we look at them with the naked eye. The Cambridge-Caltech team surpassed the quality of images taken from space by using a high-speed camera to take numerous images of the same stars at a rate of 20 frames per second. Because of fluctuations in the atmosphere, some of these were less smeared than others. The team then used computer software to choose the best images, and these were combined to create pictures far sharper than anything that has been taken from space. Dr Craig Mackay, from the Institute of Astronomy at the University of Cambridge, who led the research, said: “To produce images sharper than Hubble from the ground is a remarkable achievement by anyone’s standards. “These are the sharpest images ever taken either from the ground or from space and yet we are essentially using ‘Blue Peter’ technology. “Amateur lucky imaging is popular because the technique is so cheap and effective. “The low cost means that we could apply the process to telescopes all over the world.” The lucky imaging technique was first mooted in the late 1970s and has enabled the discovery of many multiple star systems which are too close together and too faint to find with any standard telescope. The news pictures of the globular star cluster M13, which is 25,000 light years away, are so detailed that they were able to find stars as little as one light day apart. Images of the Cat’s Eye Nebula were so fine they could pick out details separated by only a few light hours. The work was carried out on Mount Palomar, California, using the 200-inch telescope at the Palomar Observatory in conjunction with an adaptive optics system. The technique could now be used to improve much larger telescopes such as those at the European Southern Observatory in Chile, or the Keck telescopes in the top of Mauna Kea in Hawaii. This has the potential to produce even sharper images. “The images space telescopes produce are of extremely high quality but they are limited to the size of the telescope,” Dr Mackay added. “Our techniques can do very well when the telescope is bigger than Hubble and has intrinsically better resolution.”

 

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