Word: farthermost
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Dates: during 1970-1979
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...objects that astronomers have found in the skies, quasars are the most enigmatic. Though they resemble ordinary stars when viewed through optical telescopes, they are billions of lightyears* away, the farthermost objects in the observable universe. But to be seen through ordinary telescopes and detected by radio telescopes at those distances, quasars must radiate more energy than entire galaxies, which are giant islands of billions of stars. Now, while trying to explain what quasars are and how they radiate so much energy, astronomers have been confronted by yet another mystery: twin quasars...
...greater the red shift of light from a galaxy, or island of stars, the farther away the galaxy is from the earth. Indeed, using the red shift from some quasars as a yardstick indicates that they could be 10 billion or more light-years away-making them the farthermost objects ever observed in the heavens by astronomers...