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Astronomers “Weigh” a Rogue Planet and Pin Down Mass and Distance for a Starless World
这对于行星研究人员来说是第一次。
How Much Does a Single Cell Weigh? The Brilliant Physics Trick of Weighing Something Less Than a Trillionth of a Gram
科学家们找到了衡量生命最微小组成部分的巧妙方法
