Trái đất bị bóp méo vì trọng lực thay đổi?
Cập nhật: 08:08 22/03/2012 GMT+7
Việc băng tan chảy nhanh tại Bắc cực đã gây ra một hiệu ứng “bóp méo” lên lực hấp dẫn của Trái đất, NASA tuyên bố.
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