Phát hiện hành tinh giống trái đất
Cập nhật: 09:34 18/09/2009 GMT+7
ác nhà thiên văn tuyên bố hành tinh nhỏ nhất từng được phát hiện bên ngoài hệ Mặt Trời có bề mặt bằng đá giống địa cầu.Ảnh minh họa hành tinh CoRot-7b trên trang Telegraph.Hành tinh CoRoT-7b được phát hiện vào tháng 2 năm nay. Nó có khối lượng gấp 5 lần trái đất. Sau khi xác định được đường kính và khối lượng của CoRoT-7b , các nhà thiên văn cho rằng nó có bề mặt rắn và mật độ vật chất giống hành tinh của chúng ta.
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