美科家学测量宇宙膨胀速度获新进展

Latest Process on the Speed of Cosmic Expansion by American Scientists

哈勃常数是宇宙学中最基本、最重要的数值，也是天文学中一个备受关注的问题，因为它表达的是宇宙膨胀的速度，而对宇宙膨胀速度的精确认定又有助于天文学界对于暗物质这一最具争议的天文学现象的理解。本文部分内容为摘译内容，主要介绍了美国科学家最近测量出更精确的哈勃常数数值这一重要研究成果，以及该研究项目的具体方法、步骤、意义及几位当今宇宙学权威科学家对该成果的评价。

This article presents a new cosmological achievement made by an American scientist, who made the newest and most precise measurement of a most fundamental number in cosmology--the Hubble constant. It also makes some reference to the detailed information about the means, steps and significance of the project as well as the appraisal of the new achievement made by several authoritative cosmologists of the world. Some parts of the article are selected and translated by the author.