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The VLT Interferometer
Individual telescopes of the VLT observatory can currently work togehter, in groups of two or three, as the ‘VLT Interferometer’ (VLTI), so that they act as a single, giant telescope, as large as the entire group. Up to 25 times finer detail can be observed than with the individual telescopes.
In the VLT Interferometer, the light beams are combined using a complex system of mirrors in underground tunnels. To do this, the light paths must be kept equal to less than 1/1000 mm. The VLTI can reconstruct images with an angular resolution of milliarcseconds, which means that in principle it could distinguish the two headlights of a car on the Moon.