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Word: constantly (lookup in dictionary) (lookup stats)
Dates: during 1990-1999
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Usage:

...addition, they measured the stars' "red shift," which indicate the speed at which the stars are receding. Together, the speed and velocity measurements helped the researchers to target the Hubble constant...

Author: By Adam M. Taub, CRIMSON STAFF WRITER | Title: Harvard Professors Help Pinpoint Age of the Universe | 5/28/1999 | See Source »

Researchers previously believed that the Hubble constant was between 50 and 100. The new research of Cepheids gives an estimate of 70 for the constant, with a 10 percent margin of error...

Author: By Adam M. Taub, CRIMSON STAFF WRITER | Title: Harvard Professors Help Pinpoint Age of the Universe | 5/28/1999 | See Source »

Finding the Hubble constant was "a driving force" behind the design of the Hubble telescope, and the primary goal of the Hubble telescope mission, said Ed Weiler, NASA associate administrator for space science...

Author: By Adam M. Taub, CRIMSON STAFF WRITER | Title: Harvard Professors Help Pinpoint Age of the Universe | 5/28/1999 | See Source »

Combined with the best current measurements of the universe's density, the Hubble constant led scientists to their estimate of 12 billion years for the universe...

Author: By Adam M. Taub, CRIMSON STAFF WRITER | Title: Harvard Professors Help Pinpoint Age of the Universe | 5/28/1999 | See Source »

...Hubble constant and the acceleration of the universe are both necessary to estimate the age of the universe, Kirshner said...

Author: By Adam M. Taub, CRIMSON STAFF WRITER | Title: Harvard Professors Help Pinpoint Age of the Universe | 5/28/1999 | See Source »

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