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Alpha Regio altimetry data Aphrodite Terra approximately Arecibo Arecibo Observatory associated atmosphere basalts belt Beta Regio caldera channels circular complex corona crust Cycle dark deformation deposits domes Earth Earth-based radar Eistla Regio ejecta elevations emissivity eruption faults female first name flanks flow field formed fractures geological goddess graben Greek mythology Gula Mons impact crater Ishtar Terra Jet Propulsion Laboratory kilometers km in diameter Lakshmi Planum landforms large volcanoes lava flows located Maat Mons Magellan data Magellan images Magellan mission Magellan radar magma mantle mapping Mars Maxwell Montes meters Moon MRPS NASA Norse mythology observed orbit outflows Ovda patterns percent Pioneer Venus planet's surface radar radar images radar-bright radiating radius region ridges rift rock rough scarps Schaber shield field spacecraft streaks structure summit surface of Venus tectonic terrain terrestrial planets tessera tion topography Venera Venera 15 venusian craters venusian surface volcanic plains winds