Radiotélescope d'Arecibo, View

The Arecibo Radio Telescope, at Arecibo, Puerto Rico. At 1000 feet (305 m) across, it is the largest dish antenna in the world. The dish, built into a bowl in the landscape, focuses radio waves from the sky on the feed antenna suspended above it on cables. Since the dish itself can't move, the telescope is steered to point at different regions of the sky by moving the feed antenna (dome) along the curving metal track. May of 2008 marked a live demonstration of their first four-continent, real-time, electronic Very Long Baseline Interferometry (e-VLBI) observations.