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Volcanoes exist on solid planetary surfaces across the solar system. They tell us about volcanism itself, tectonic/internal activity, the surface environment when they were formed, and subsequent evolution. Recent high-resolution remote sensing data on extraterrestrial bodies allows us to analyze outcrop scales. Now, we are on the stage to share the research targets beyond general volcanology and planetary science. Because some geomorphological and geological environments on other planets are similar to those on Earth, research on volcanic geomorphology and geology on Earth will provide suitable terrestrial analogs to understand planetary volcanology. This session discusses the formation history and mechanism of volcanoes across the solar system.