M31D eclipsing binaries and Cepheids

We undertook a long-term project, DIRECT, to obtain the direct distances to two important galaxies in the cosmological distance ladder - M31 and M33 - using detached eclipsing...我们实施了一项名为DIRECT的长期研究计划，旨在借助分离食（detached eclipsing...）技术，测定宇宙距离阶梯（cosmological distance ladder）中两个关键星系——M31与M33的直接距离。