Tìm ra vật chất cứng hơn thép 10 tỷ lần
Cập nhật: 08:02 20/04/2009 GMT+7
Lớp vỏ của những ẩn tinh có độ cứng gấp 10 tỷ lần so với thép thông thường. Điều này giúp chúng tạo ra những đợt sóng trọng trường mà chúng ta có thể phát hiện từ trái đất.
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