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1 (of 2) r. Arno Penzias during an interview at the 54th meeting of Nobel Laureates in Lindau, Germany, 2004. Copyright © Nobel Media AB 2004
Photo: Jonas Rosén

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2 (of 2) The 15 meter Holmdel horn antenna at Bell Telephone Laboratories in Holmdel, New Jersey was built in 1959 for pioneering work in communication satellites for the NASA ECHO I. In 1964, radio astronomers Robert Wilson and Arno Penzias discovered the cosmic microwave background radiation with it, for which they were awarded the 1978 Nobel Prize in Physics. Photo taken in June 1962.

Photo: NASA, Public domain, via Wikimedia Commons