National Geographic : 2014 Apr
Baseline A C B A C B A A B B A BB CA C B DC DA D D 101 102 103 1 10-1 10-2 10-3 10-4 10-5 10-6 10-7 10-8 10-9 10-10 10-11 10-12 Radio waves Microwaves THE ELECTROMAGNETIC SPECTRUM (in meters) Infrared Ultraviolet X-rays Gamma rays Visible spectrum ALMA range 12-meter antenna Baseline Antenna pad Service roads Mt. Everest Atacama Plateau (ALMA location) Machu Picchu SOUTH AMERICA CHILE ALMA Ten-milediameter alma’s ten-mile -wide zoom Elevation: 16,400 feet rearranging antennas on the wide plateau is like adjusting a camera’s zoom. at maximum spread, shown here, the telescope focuses in on tight sections of sky and fine details. clustering the antennas closer together is like using a wide- angle lens to take in broader swaths of sky. aLma consists of two telescope arrays working together. two massive transporters relocate antennas in the main array with submillimeter precision. the morita array (above), a separate group of 16 antennas built by Japan, targets large-scale structures in the universe.