The Milky Way over the ALMA radio telescopes in Chile. Mars is shining brightly right of centre. ALMA (Atacama Large Millimetre/sub-millimetre Array) is an array of 66 radio antennae located at an elevation of 5000 metres on the arid Chajnantor plateau in the Chilean Andes. Data from the separate antennae are combined by interferometry, making it one of the most powerful telescopes in the world.
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