DR SETH SHOSTAK / SCIENCE PHOTO LIBRARY DR SETH SHOSTAK / SCIENCE PHOTO LIBRARY
Parkes radio telescope. View of the Parkes radio telescope, New South Wales, Australia at sunset. The rotating dish is 64 metres (210 feet) in diameter and divided into three sections. It has a solid steel plate from its centre to a diameter of 17 metres, a perforated aluminium plate to a diameter of 42 metres, and the rest is a mesh of galvanised steel. The weight of the dish is 300 tonnes. This radio dish is used to observe wavelengths from 5 millimetres to 2 centimetres. Parkes was completed in 1961, and in 1998 is run as part of the Australia Telescope National Facility. It is often used by the SETI (Search For Extraterrestrial Intelligence) institute.
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