中国科学家精确测量!银河系“体重”算出来了

来源:科技日报

银河系的最新“体重”来了!20日,记者从中科院国家天文台获悉,基于我国郭守敬望远镜(LAMOST)和美国APOGEE巡天的观测数据,我国天文学家精确测量了距离银河系中心1.6万光年至8.1万光年范围内的恒星运动速度,并估算出银河系的“体重”约为8050亿个太阳质量。相关研究成果在线发表于《天体物理学报》。

测量银河系的质量,是一个充满挑战的难题,没有现成的体重秤能给这个星系级的“大胖子”称体重。测量银河系的旋转曲线,也就是距离银河系中心不同距离的恒星的运动速度,是目前天文学家为银河测量质量的常用方法之一。

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Auto Shanghai: China carmakers show new tech and amp up for global EV market

Source: China carmakers amp up for global EV market at Shanghai auto show – CGTN

China’s electric vehicle revolution is in full swing as domestic car manufacturers gear up to challenge the world’s leading players, with innovative technologies, latest models and batteries showcased at the 20th Shanghai International Automobile Industry Exhibition, also known as Auto Shanghai 2023.

Themed “Embracing the New Era of the Automotive Industry,” the exhibition kicked off on Tuesday and displays more than 1,500 vehicles with two-thirds of them being electric ones, defining the “new era” as the “electric-powered era.”

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