The biggest radio telescope ever is being built in China. It measures 500 m (1,640 ft) across and it fits an already existing cratere in the Guizhou province. The former record holder was the Aricebo Observatory, on the other side of the world, in Puerto Rico, with a diametre of “only” 305m (1,000ft).
It took 10 years to find the perfect spot for this huge structure, but once it was found it only took 5 years to build it, and these days the whole work is very close to an end. What will it be used for, then? First of all, it will be searching for ancient signals of hydrogen, to understand how the cosmos evolved. It will also look for new stars, and it will greatly contribute to the search for extraterrestrial life in the universe.
In the pictures you can see the slow (well, not that slow) process of the telescope being built over the last few years.
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