Radio telescope
A radio telescope is a type of antenna used for radio astronomy. The majority look like a huge satellite television dish. Stars shine, and the light can be seen with an ordinary telescope, but they also give off radio waves. Scientists with radio telescopes receive these radio waves and use computers to learn about the stars. Other things like black holes also give off radio waves, and radio telescopes are useful for learning about them too.
The dish is sometimes constructed of a conductive wire mesh whose openings are smaller than a wavelength. The information received by several radio telescopes in different places can be combined. This gives similar results to having a single dish as big as the distance between the telescopes. It can receive very faint signals, and see more details. The biggest telescope is a virtual radio telescope almost as big as the Earth, called the Event Horizon Telescope.
The radio telescope at the Parkes Observatory, Parkes, New South Wales was used by NASA to receive messages from the Apollo 11 moon landings.
Radio Telescope Media
The 64-meter radio telescope at Parkes Observatory as seen in 1969, when it was used to receive live televised video from Apollo 11
Antenna of UTR-2 low frequency radio telescope, Kharkiv region, Ukraine. Consists of an array of 2040 cage dipole elements.
Ooty radio telescope, a 326.5 MHz dipole array in Ooty, India
Plot of Earth's atmospheric transmittance (or opacity) to various wavelengths of electromagnetic radiation.
The Very Large Array in Socorro, New Mexico, an interferometric array formed of 27 parabolic dish telescopes.
Atacama Large Millimeter Array in the Atacama desert consisting of 66 12-metre (39 ft), and 7-metre (23 ft) diameter radio telescopes designed to work at sub-millimeter wavelengths
The 500 meter Five hundred meter Aperture Spherical Telescope (FAST), under construction, China (2016)
The 100 meter Green Bank Telescope, Green Bank, West Virginia, US, the largest fully steerable radio telescope dish (2002)
The 100 meter Effelsberg, in Bad Münstereifel, Germany (1971)
The 76 meter Lovell, Jodrell Bank Observatory, England (1957)
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