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The h-index, created by Jorge E. Hirsch in 2005, is an attempt to measure the research impact of a scholar. In his 2005 article Hirsch put forward an easily computable index, h, which gives an estimate of the importance, significance, and broad impact of a scientist's cumulative research contributions..
If we assume that H0 provides us with a value for the current rate of expansion then its inverse, that is 1/ H0 tells us the Hubble time which is a measure of the age of a universe expanding at a constant rate. Hubble calculated a value for H0 of about 500 km. s -1. Mpc -1.