Jackson Neal
Jodrell Bank Centre for Astrophysics, University of Manchester, Turing Building, Manchester, M13 9PL UK.
Living Rev Relativ. 2007;10(1):4. doi: 10.12942/lrr-2007-4. Epub 2007 Sep 24.
I review the current state of determinations of the Hubble constant, which gives the length scale of the Universe by relating the expansion velocity of objects to their distance. In the last 20 years, much progress has been made and estimates now range between 60 and 75 km s Mpc, with most now between 70 and 75 km s Mpc, a huge improvement over the factor-of-2 uncertainty which used to prevail. Further improvements which gave a generally agreed margin of error of a few percent rather than the current 10% would be vital input to much other interesting cosmology. There are several programmes which are likely to lead us to this point in the next 10 years.
我回顾了哈勃常数测定的现状，哈勃常数通过将天体的退行速度与其距离相关联，给出了宇宙的长度尺度。在过去20年里，已经取得了很大进展，目前的估计值在60至75千米每秒每百万秒差距之间，大多数现在在70至75千米每秒每百万秒差距之间，这比过去普遍存在的两倍的不确定性有了巨大改进。进一步的改进能给出普遍认可的百分之几的误差范围，而不是目前的10%，这将是许多其他有趣宇宙学研究的关键输入。有几个项目可能会在未来10年引领我们达到这一目标。
