最終更新日：2024/08/03
The Niven ring is a hypothetical megastructure around a star.
正解を見る
The Niven ring is a hypothetical megastructure around a star.
編集履歴（0）
The Niven ring is a hypothetical megastructure around a star.
The Niven ring is a hypothetical megastructure around a star.
DiQt（ディクト）
無料
★★★★★★★★★★
