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Artificial sun for Tyrol

17.02.2006

Austrian engineers figured out how to give sunlight to the inhabitants of narrow gorges.

The city of Rattenberg in the Austrian Tyrol was built in the Middle Ages near the Rat Mountain. Its founder was only interested in the fortification capabilities of the fortress, and the fact that a mountain 900 meters high hides the settlement from the sun for three winter months was not taken into account. Now this circumstance has turned out to be decisive for the life of the city: the inhabitants of Rattenberg are gradually leaving for places with a more hospitable climate.

Austrian engineers from Bartenbach LichtLabor decided to change the situation with the help of the European innovation support initiative EUREKA. They propose to install heliostats 400 meters from the city - giant mirrors on movable supports. These mirrors track the movement of the Sun and transmit its light to reflectors that will be mounted on the castle hill.

Unlike heliostats, reflectors are rigidly fixed and illuminate a particular area. “We will not be able to illuminate the entire Rattenberg, but we will create five or six large spots of sunlight in it. As a result, local residents and tourists will have the feeling that the city is literally flooded with sun, and this is very important for psychological comfort.

If the project turns out to be successful, it is hoped that the authorities of other cities experiencing similar problems will give money to create the same systems of natural lighting," says company representative Wilfried Pohl.

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Crater in the desert 12.10.2010

Studying satellite images of the Earth, Egyptian and Italian astronomers discovered in the desert near the Egyptian city of Kamal, near the border with Tunisia, a previously unknown meteorite crater.

A small depression with a diameter of 45 meters was formed about two thousand years ago when an iron meteorite weighing about 1600 kilograms fell into the ground at a speed of more than three kilometers per second. Upon impact, the meteorite shattered into thousands of fragments weighing from one gram to 83 kilograms.

Craters from the fall of small meteorites are quite rare, there are only 300 such depressions with a diameter of less than 15 meters on Earth. Not very large meteorites often break up in the atmosphere, and if they do leave a crater, it usually quickly overgrows and is masked by erosion.

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