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Radar astronomy
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== Telescopes and facilities== The [[Goldstone Solar System Radar]] is the only planetary radar in current regular operation.<ref>{{cite journal |title=Planetary radar—State-of-the-art review |last1= Virkki |first1= Anne K. |last2= Neish |first2= Catherine D. |last3= Rivera-Valentín |first3= Edgard G. |last4= Bhiravarasu |first4= Sriram S. |last5= Hickson |first5= Dylan C. |last6= Nolan |first6= Michael C. |last7= Orosei |first7= Roberto |journal=Remote Sensing |volume=15 |issue=23 |pages=5605 |year=2023 |publisher=MDPI |url=https://www.mdpi.com/2072-4292/15/23/5605 }}</ref> Others are or were: * The planetary radar at [[Arecibo Observatory]], which collapsed in 2020. * The Soviet planetary radar at the [[Pluton (complex)|Pluton complex]], since dismantled. * The Millstone Hill and Haystack radio telescopes of the [[Haystack Observatory]] made radar observations from 1958 through at least 1970.<ref>{{cite journal |title=The Haystack Planetary Ranging Radar |last1=Evans |first1=JV |last2=Ingalls |first2=RP |last3=Pettengill |first3=GH |journal=Technical Report-Jet Propulsion Laboratory, California Institute of Technology |issue=32 |pages=27 |year=1970 |publisher=Jet Propulsion Laboratory, California Institute of Technology}}</ref> * The [[Yevpatoria RT-70 radio telescope]] is equipped with a powerful transmitter, and has been used in bi-static radar observations.<ref>{{cite web |url=https://www.ursi.org/proceedings/procGA02/papers/p1745.pdf |title=BISTATIC RADAR TEST ACTIVITIES AT THE ITALIAN MEDICINA RADIOTELESCOPES}}</ref> There are proposals and prototypes for possible additional radars: * The [[Green Bank Telescope |Green Bank Observatory]] is investigating a Ku-band radar for its 100 meter radio telescope.<ref>{{cite web |url=https://amostech.com/TechnicalPapers/2022/Poster/Taylor.pdf |title=The next generation planetary radar system on the Green Bank Telescope}}</ref> Its low power prototype has imaged the moon. * China is developing a planetary radar.<ref>{{cite web |url=https://www.tsinghua.edu.cn/en/info/1320/11412.htm |title=China begins construction on world’s most far-reaching radar system, to boost defense against near-Earth asteroid impact}}</ref> Their initial phase has imaged the moon.
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