The Karl G. Jansky Very Large Array (VLA) is a centimeter-wavelength radio astronomy observatory
located in central New Mexico .... The VLA comprises twenty-eight 25-meter radio telescopes
(27 of which are operational while one is always rotating through maintenance) deployed in a Y-shaped array. ...
Each of the massive telescopes is mounted on double parallel railroad tracks, so the radius and density of the array
can be transformed ... [1] Astronomers using the VLA have made key observations of black holes and protoplanetary disks
around young stars, discovered magnetic filaments and traced complex gas motions at the Milky Way's center,
probed the Universe's cosmological parameters, and provided new knowledge about the physical mechanisms
that produce radio emission. - Wikipedia