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{{Infobox scientist
| name = Arno Allan Penzias
| image = 32. Tagung 1982 Physiker; Beim Studentenabend Arno A. Penzias - W134Nr.119142 - Willy Pragher (cropped).jpg
| alt =
| caption = Penzias in
| birth_date = {{birth date|1933|4|26}}
| birth_place = [[Munich]], Bavaria, Germany
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| citizenship = {{ubl|[[Nazi Germany|Germany]] ([[Nuremberg Laws|until 1935]])|[[Statelessness|Stateless]] (1935–1946)|United States (from 1946)}}
| field = [[Physics]]
| alma_mater = {{ubl|[[City College of New York]] (BS)|[[Columbia University]] (MA, PhD)}}▼
| work_institution = {{ubl|[[Bell Labs]]|[[Columbia University]]}}
| doctoral_advisor = [[Charles H. Townes]]
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| spouse = {{marriage|Sherry Levit|1996}}
| children = 5
▲|
}}
{{
'''Arno Allan Penzias''' ({{IPAc-en|ˈ|p|ɛ|n|z|i|ə|s}}; April 26, 1933 – January 22, 2024) was an American [[physicist]] and [[radio astronomer]]. Along with [[Robert Woodrow Wilson]], he discovered the [[cosmic microwave background radiation]], for which he shared the [[Nobel Prize in Physics]] in 1978.
==Early life and education==
Penzias was born in [[Munich]],
He graduated from [[Brooklyn Technical High School]] in 1951 and after enrolling to study chemistry at the [[City College of New York]], he changed majors and graduated 1954 with a degree in physics, ranked near the top of his class.<ref name=":0" /><ref>{{cite web |title=Dr. Arno Penzias '51 |url=http://www.bths.edu/apps/pages/index.jsp?uREC_ID=228863&type=d&termREC_ID=&pREC_ID=443924 |access-date=March 18, 2014 |website=[[Brooklyn Technical High School]] |publisher=}}</ref> Following graduation, Penzias served for two years as a [[radar]] officer in the [[U.S. Army Signal Corps]].<ref name=npr /> This led to a research assistantship in the [[Columbia University]] Radiation Laboratory, which was then heavily involved in microwave physics. Penzias worked under [[Charles H. Townes]], who later invented the [[maser]].<ref name=wapo/> Penzias enrolled as a graduate student at Columbia University in 1956, where he earned a master's degree and a PhD in physics, the latter in 1962.<ref>{{cite web |url=http://www.ieeeghn.org/wiki/index.php/Arno_Allan_Penzias |title=Arno Allan Penzias |work=IEEE Global History Network |publisher=IEEE |access-date=August 10, 2011 |archive-url=https://web.archive.org/web/20100707231859/http://www.ieeeghn.org/wiki/index.php/Arno_Allan_Penzias |archive-date=July 7, 2010 |url-status=live }}</ref>
==Career==
Penzias went on to work at [[Bell Labs]] in [[Holmdel Township, New Jersey]], where, with Robert Woodrow Wilson, he worked on ultra-sensitive cryogenic [[microwave]] receivers, intended for radio astronomy observations. In 1964, on building their most sensitive [[Holmdel Horn Antenna|antenna/receiver system]], the pair encountered radio noise
[[File:Horn Antenna-in Holmdel, New Jersey - restoration1.jpg|thumb|left|Penzias and Wilson stand at the 15 meter [[Holmdel Horn Antenna]] that brought their most notable discovery]]▼
▲Penzias went on to work at [[Bell Labs]] in [[Holmdel, New Jersey]], where, with Robert Woodrow Wilson, he worked on ultra-sensitive cryogenic [[microwave]] receivers, intended for radio astronomy observations. In 1964, on building their most sensitive [[Holmdel Horn Antenna|antenna/receiver system]], the pair encountered radio noise which they could not explain.<ref>{{cite web |author= |title=Nobel-prize winning accidents |url=http://www.physics.org/featuredetail.asp?id=71 |url-status=dead |archive-url=https://web.archive.org/web/20131203162043/http://www.physics.org/featuredetail.asp?id=71 |archive-date=December 3, 2013 |access-date=April 24, 2012 |website=[[Phys.org]]}}</ref> It was far less energetic than the radiation given off by the [[Milky Way]], and it was [[isotropic]], so they assumed their instrument was subject to interference by terrestrial sources. They tried, and then rejected, the hypothesis that the radio noise emanated from New York City. An examination of the microwave [[horn antenna]] showed it was full of bat and pigeon droppings (which Penzias described as "white [[dielectric]] material"). After the pair removed the dung buildup the noise remained. Having rejected all sources of interference, Penzias contacted [[Robert Dicke]], who suggested it might be the background radiation predicted by some cosmological theories. The pair agreed with Dicke to publish side-by-side letters in the Astrophysical Journal, with Penzias and Wilson describing their observations<ref>{{cite journal|last1=Penzias|first1 = A.A.|last2 = Wilson|first2=R.W.|title=A Measurement of Excess Antenna Temperature at 4080 Mc/s|journal=[[Astrophysical Journal]]|volume=142|pages=419–421|date=1965|doi=10.1086/148307|bibcode=1965ApJ...142..419P|doi-access=free}}</ref> and Dicke suggesting the interpretation as the [[cosmic microwave background radiation]] (CMB), the radio remnant of the [[Big Bang]].<ref name="Nobel"/><ref>{{cite magazine |last=Lehrer |first=Jonah |url=https://www.wired.com/magazine/2009/12/fail_accept_defeat/all/ |title=The Neuroscience of Screwing up |magazine=[[Wired (magazine)|Wired]] |date=December 21, 2009 |access-date=December 21, 2009 |archive-url=https://web.archive.org/web/20091229035926/http://www.wired.com/magazine/2009/12/fail_accept_defeat/ |archive-date= December 29, 2009 |url-status=dead}}</ref> This proved to be landmark evidence for the Big Bang and provided substantial confirmation for predictions made by [[Ralph Asher Alpher]], [[Robert Herman]] and [[George Gamow]] in the 1940s and 1950s.
▲[[File:Horn Antenna-in Holmdel, New Jersey - restoration1.jpg|thumb|
==Personal life==
Penzias was a resident of [[Highland Park, New Jersey]], in the 1990s.<ref>{{cite news |last=Horner |first=Shirley |url=https://query.nytimes.com/gst/fullpage.html?res=9F0CE5DD1031F930A35753C1A965958260 |title=About Books |work=[[The New York Times]] |date=October 3, 1993 |access-date=October 23, 2009 |archive-url=https://web.archive.org/web/20071228205150/http://query.nytimes.com/gst/fullpage.html?res=9F0CE5DD1031F930A35753C1A965958260 |archive-date=December 28, 2007 |url-status=dead }}</ref> In 1996, Penzias married [[Silicon Valley]] executive Sherry Levit.<ref name=":0" /> He had a son, David, and two daughters, Mindy Penzias Dirks, and Rabbi Shifra (Laurie) Weiss-Penzias.<ref>Schlessinger B., Bernard S. and June H., ''Who's Who of Nobel Prize Winners,
Penzias died from complications of [[Alzheimer's disease]] at an assisted living facility in San Francisco, on January 22, 2024, at the age of 90.<ref name=":0">{{Cite news |last=Hafner |first=Katie |author-link=Katie Hafner |date=January 22,
==Honors and awards==
Penzias was elected a Fellow of the [[American Academy of Arts and Sciences]] and the National Academy of Sciences in 1975.<ref name=AAAS>{{cite web |title=Book of Members,
On April 26, 2019, the Nürnberger Astronomische Gesellschaft e.V. (NAG) inaugurated the 3-
On September 11, 2023, the Radio Club of America said that Penzias would be honored with the inauguration of the
==Works==
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==See also==
{{commons category|Arno Penzias}}▼
* [[Discovery of cosmic microwave background radiation]]
* [[List of Jewish Nobel laureates]]
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==External links==
{{Wikiquote}}
* {{Nobelprize}} including the Nobel Lecture, December 8, 1978,
* [https://www.scribd.com/doc/22155/The-Ideas-of-Arno-Penzias/ The first part of
* [https://www.scribd.com/doc/22888/Ideas-of-Arno-Penzias-II/ The second part of
* [https://www.imdb.com/title/tt1434807/ A Whisper From Space] (IMDb)
* {{IMDb name|3293692}}
* {{Discogs artist|Arno Penzias}}
* [https://www.nag-ev.de/radioastronomie.php Nürnberger Astronomische Gesellschaft e.V.: Web-Seite Arno-Penzias-Radioteleskop (german)]
{{Nobel Prize in Physics
{{1978 Nobel Prize winners}}
{{Authority control}}
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[[Category:1933 births]]
[[Category:2024 deaths]]
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[[Category:American Nobel laureates]]
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[[Category:Jewish astronomers]]▼
[[Category:City College of New York alumni]]
[[Category:Columbia Graduate School of Arts and Sciences alumni]]
[[Category:Columbia University staff]]
[[Category:Deaths from Alzheimer's disease in California]]
[[Category:Deaths from dementia in California]]
[[Category:Emigrants from Nazi Germany to the United States]]
[[Category:Fellows of the American Academy of Arts and Sciences]]▼
[[Category:Fellows of the American Physical Society]]
[[Category:Jewish American physicists]]
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[[Category:Scientists at Bell Labs]]▼
▲[[Category:Fellows of the American Academy of Arts and Sciences]]
[[Category:Members of the United States National Academy of Engineering]]
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[[Category:Military personnel from New York City]]
[[Category:Military personnel from New York (state)]]
[[Category:Nobel laureates in Physics]]
[[Category:People from Highland Park, New Jersey]]
▲[[Category:Scientists at Bell Labs]]
[[Category:Scientists from New York (state)]]
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