ECHO horn antenna. This horn reflector antenna at Bell Telephone Laboratories in Holmdel, New Jersey, USA, was built in 1959. It was used for pioneeri
ECHO horn antenna. This horn reflector antenna at Bell Telephone Laboratories in Holmdel, New Jersey, USA, was built in 1959. It was used for pioneering work with NASA's ECHO balloon satellites. Aluminium with a steel base, it is over 15 metres long and weighs 18 tons. It was later modified to work with Telstar communication satellites. It is most famous for its use in 1963-4 by US astrophysicists Robert W. Wilson and Arno A. Penzias to unexpectedly discover the microwave background radiation from the Big Bang origin of the universe. In 1990 it was designated a US National Historic Landmark. Photographed in June 1962.
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Photo credit: © NASA/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No
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