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In this overview article, we summarize how radar observations have contributed in planetary science, how the radar technology as a remote-sensing method for planetary exploration and the methods to interpret the radar data have advanced in the eight decades of increasing use, where the field stands in the early 2020s, and what are the future prospects of the ground-based facilities conducting planetary radar observations and the planned spacecraft missions equipped with radar instruments. The focus of the paper is on radar as a remote-sensing technique using radar instruments in spacecraft orbiting planetary objects and in Earth-based radio telescopes, whereas ground-penetrating radar systems on landers are mentioned only briefly. The key scientific developments are focused on the search for water ice in the subsurface of the Moon, which could be an invaluable in situ resource for crewed missions, dynamical and physical characterization of near-Earth asteroids, which is also crucial for effective planetary defense, and a better understanding of planetary geology.<\/jats:p>","DOI":"10.3390\/rs15235605","type":"journal-article","created":{"date-parts":[[2023,12,2]],"date-time":"2023-12-02T13:45:41Z","timestamp":1701524741000},"page":"5605","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Planetary Radar\u2014State-of-the-Art Review"],"prefix":"10.3390","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4129-5381","authenticated-orcid":false,"given":"Anne","family":"Virkki","sequence":"first","affiliation":[{"name":"Department of Physics, University of Helsinki, Gustaf H\u00e4llstr\u00f6min katu 2a, 00560 Helsinki, Finland"},{"name":"Finnish Geospatial Research Institute, National Land Survey, 02150 Espoo, Finland"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3254-8348","authenticated-orcid":false,"given":"Catherine","family":"Neish","sequence":"additional","affiliation":[{"name":"Department of Earth Sciences, University of Western Ontario, London, ON N6A 3K7, Canada"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4042-003X","authenticated-orcid":false,"given":"Edgard","family":"Rivera-Valent\u00edn","sequence":"additional","affiliation":[{"name":"Johns Hopkins University Applied Physics Laboratory, Laurel, MD 20723, USA"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0019-6261","authenticated-orcid":false,"given":"Sriram","family":"Bhiravarasu","sequence":"additional","affiliation":[{"name":"Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380015, India"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0158-9537","authenticated-orcid":false,"given":"Dylan","family":"Hickson","sequence":"additional","affiliation":[{"name":"MDA Geospatial Services Inc., Ottawa, ON K2E 8B2, Canada"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8316-0680","authenticated-orcid":false,"given":"Michael","family":"Nolan","sequence":"additional","affiliation":[{"name":"Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721, USA"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1277-1294","authenticated-orcid":false,"given":"Roberto","family":"Orosei","sequence":"additional","affiliation":[{"name":"INAF\u2014Istituto di Radioastronomia, 40128 Bologna, Italy"}]}],"member":"1968","published-online":{"date-parts":[[2023,12,2]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"861","DOI":"10.5194\/angeo-38-861-2020","article-title":"Radar observability of near-Earth objects using EISCAT 3D","volume":"38","author":"Kastinen","year":"2020","journal-title":"Ann. 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