But there are independent ways to measure the Hubble constant.

但是还有别的的测量哈勃常数的方法。

This is measured by the Hubble constant: the rate at which distant galaxies are receding, depending on their distance apart.

遥远的星系彼此远离的速度，取决于它们之间的距离。

The currently accepted rate, called the " Hubble constant, " is 10 percent slower than the value resulting from distances between galaxies closest to Earth.

目前可以接受的速率称为" 哈勃常数" ，比根据离地球最近的星系之间的距离计算出的值慢10%。

Freedman led a collaboration in the 1990s called the Hubble Space Telescope Key Project, which calculated the Hubble constant more precisely than anyone had before.

弗里德曼在 20 世纪 90 年代领导了一项名为“哈勃太空望远镜关键项目”的合作，该项目比以前任何人都更精确地计算了哈勃常数。