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収縮する月は月面地震を発生させる可能性がある
https://www.nasa.gov/press-release/goddard/2019/moonquakes
月は縮んでいる…NASA無人探査機撮影の画像で判明
https://www.afpbb.com/articles/-/3224879?cx_part=top_topstory&cx_position=4
