Timelapse of the Milky Way over the ALMA radio telescopes, in the Atacama Desert, Chile. The bright pink Carina Nebula is seen in the Milky Way. ALMA (Atacama Large Millimetre sub-millimetre Array) is an array of 66 radio telescopes located at an altitude of 5000 metres on the Chajnantor plateau. Data from the separate telescopes is combined by interferometry, making it one of the most powerful and complex observatories in the world.