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In August 2020 the Arecibo Observatory ([[Arecibo Observatory|Arecibo Planetary Radar]]) suffered a structural cable failure, leading to the collapse of the main telescope in December of that year.<ref name="NSFrelease20-010">{{cite web |title=Giant Arecibo radio telescope collapses in Puerto Rico|url=https://www.theguardian.com/world/2020/dec/01/arecibo-radio-telescope-collapses-puerto-rico |website=www.theguardian.com |date=December 2020 |access-date=March 5, 2021 |language=en }}</ref>
As of 2023, there were two radar astronomy facilities in regular use, the [[Goldstone Solar System Radar]] and [[Yevpatoria RT-70 radio telescope|Evpatoria Planetary Radar]].<ref>{{Cite conference |last=Bezrukovs |first=Vladislavs |last2=Dugin |first2=Nikolai |last3=Skirmante |first3=Karina |last4=Jasmonts |first4=Gints |last5=Šteinbergs |first5=Jānis |date=2023 |title=The forward scatter radar method for detecting space objects using emission of extraterrestrial radio sources |url=https://conference.sdo.esoc.esa.int/proceedings/neosst2/paper/125 |conference=2nd NEO and Debris Detection Conference |language=en}}</ref>
== Advantages ==
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| date = October 1961
| url = https://ieeexplore.ieee.org/document/5259664
| archive-url = https://web.archive.org/web/20180125020130/http://ieeexplore.ieee.org/document/5259664/
| url-status = dead
| archive-date = January 25, 2018
| doi = 10.1049/jbire.1961.0121
| format = PDF
| title=The astronomical unit determined by radar reflections from Venus
| last1=Muhleman |first1=Duane O. |last2=Holdridge |first2=D. B. |last3=Block |first3=N.
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