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Wikipedia definition
1. Main (lunar crater)Main is a lunar crater that is located near the north pole of the Moon. The southern rim of this formation has merged with the larger crater Challis to the south, and the level interior floor connects the two craters through a narrower gap. To the north-northwest of Main is Gioja.
Read “Main (lunar crater)” on English Wikipedia
Read “メイン (クレーター)” on Japanese Wikipedia
Read “Main (lunar crater)” on DBpedia

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