Very sharp images , The Keep them. What makes it unusual is that it is taken from the surface of the earth. It took two years of work (NRAO, United States) To develop the technology that made this extraordinary image possible.
At the origin of this incredible film, there is , The largest Fully Orientable from the world installed in the United States. It was fitted with a transmitter that allowed it to transmit a radar signal into space. This signal is reflected on the surface Accepted Very long baseline array (VLBA) This has created a dubious image. You can observe the details up to five meters in it!
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