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You might be wondering why an ALMA antenna is being driven around by this yellow truck in today's Picture of the Week. Like a huge taxi, this vehicle was specifically designed to transport the antennas around the Chajnantor plateau in the Chilean Andes.
The Atacama Large Millimeter/submillimeter Array (ALMA), an international collaboration in which ESO is a partner, consists of 66 antennas that work together like a single gigantic telescope. The antennas can be rearranged into different layouts, allowing ALMA to discern different levels of detail. The distance between the antennas ranges from a few tens of metres, ideal to observe diffuse structures, to a maximum of 16 kilometres, perfect to study really small details.
This is when the yellow trucks come into play. There are two identical ALMA transporters, named Otto and Lore, which were provided by ESO and manufactured by the company Scheuerle Fahrzeugfabrik GmbH. These vans must be powerful enough to carry an antenna weighting over 100 tons, but also accurate enough to position them with a precision of a few millimetres.