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Image: Kwanzaa tholus on Ceres

What is a tholus? A tholus is a type of small mountain. These images show such a feature on dwarf planet Ceres called Kwanzaa Tholus. Kwanzaa, meaning "first fruits" in Swahili, is an African-American festival based on ancient ...

dateDec 28, 2017 in Space Exploration
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