Khối cầu lửa tại Mỹ là thiên thạchMột người đàn ông vừa tìm thấy mẩu thiên thạch gây nên khối cầu lửa bí ẩn tại Mỹ tuần trước ở bang Wisconsin.
gt; Cầu lửa bí ẩn trên bầu trời MỹCầu lửa phát sáng khoảng 15 phút trước khi vỡ thành nhiều mảnh nhỏ hơn rồi biến mất vào tối 14/4. Ảnh: CNN.AP cho biết, mảnh thiên thạch có khối lượng khoảng 135 g và chỉ nhỏ bằng một hạt lạc. Nhà địa chất John Valley của Đại học Wisconsin, Mỹ nói mẩu đá bé xíu được bao phủ bởi một lớp màu đen mỏng như giấy.
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