Mặt trăng có thể từng là một phần của địa cầu
Cập nhật: 08:19 20/10/2012 GMT+7
Trái đất và mặt trăng từng là một khối cầu trước khi trái đất va chạm với hành tinh khác, hai nhà khoa học Mỹ khẳng định.
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