Star trails over ALMA telescopes. View of the Milky Way over the antennas of the ALMA (Atacama Large Millimetre/submillimeter Array) telescope array at night. ALMA is an array of 66 radio antennas that combines data by interferometry, making it one of the most powerful telescopes in the world. It is located on the Chajnantor plateau in the Chilean Andes. The Southern Cross, Coalsack Nebula, and the red-shining Carina Nebula can be seen at right. The Small Magellanic Cloud is at left. Photographed with a special deep sky filter.