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The very large telescope array (VLT) is a fascinating and beautiful set of four 8-meter diameter telescopes in the high plains of northern chile. the telescopes can be used together to create one large interferometer or they can each be used individually with the unique instruments that have been crafted specially for each one. ALL IMAGES: (eso.org) taken on location by Stephane Guisard and Jose Francisco Salgado.
The laser beam, shining at a well-defined wavelength, makes the layer of sodium atoms that is present in Earth's atmosphere at an altitude of 90 kilometres glow.