Digitally enhanced image of a bolt of lightning above several of the dish antennae which make up the Very Large Array (VLA) radio telescope near Socorro, New Mexico. The VLA is the world's largest single-location radio telescope array, consisting of 27 dishes (plus one spare), each 25 metres in diameter. The dishes can be moved to various positions along the arms of a Y-shaped railway network. Two of the arms are 21 km in length, the third is 19 km. The data from all the dishes are combined to produce a single radio image, simulating the effect of using a single 27 km diameter radio dish.