Tìm thấy hành tinh tí hon ngoài hệ mặt trời
Đó là hành tinh nhỏ nhất từng được khám phá bên ngoài thái dương hệ của chúng ta, với bán kính chỉ gấp rưỡi bán kính trái đất, các nhà khoa học Tây Ban Nha vừa tiết lộ.
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