Mặt trăng có thể từng là một phần của địa cầu
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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u4HDoHIk4bu24buO4bqr4bqj4buBJeG7oOG6v+G6o3Fvw7LhuqPhu43hu43hu7Qvb+G7tg==