Word: xl
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Dates: during 1970-1979
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Because black holes emit no light or other radiation, their existence, predicted by the laws of relativity, cannot be confirmed by direct observation, but it can be inferred. Astronomers have identified a powerful X-ray source in the constellation Cygnus. Some suspect the source, which has been labeled Cygnus Xl, may be just such a black hole. It appears to be rotating with a visible star around a common center of gravity−a dead partner of a dualstar system. Scientists believe material from the glowing star is being drawn into the black hole with such force that the material...
...almost certain that they have located a black hole. Its presence was hinted at in 1971 by the first earth-orbiting X-ray satellite Uhuru, which detected a strong and widely fluctuating flow of X rays from Cygnus. Scientists suspected that the radiation source, which they named Cygnus Xl, was a pulsar, or neutron star, the result of a different form of stellar collapse. But the uneven fluctuations bore no resemblance to the steady bursts of radiation from other pulsars...
Shortly thereafter, radio astronomers, using their more sharply focused antennas, picked up radio signals from the area. That gave a much more precise fix on Cygnus Xl, letting other astronomers train big optical telescopes on the site. There they found a huge star, a so-called class-B supergiant, at least 20 times as massive as the sun. It was traveling erratically through space, as if it were being tugged by a smaller companion star moving around it. From this gravitational pull, astronomers figured that the unseen star had at least three times the mass...
...largest distiller, will diversify its Four Roses blend and begin selling a "light blend" under the same name. The company will also have a new light brand called Galaxy. Schenley will introduce no fewer than six light variations of regular products, including J.W. Dant Premium Light, Schenley XL, and Red Satin. American Brands, taking a cue from makers of the fast-selling pop wines, is giving its products names that sound like rock groups: White Balloon and Honey Go Light...
...without Buck Rogers there might not have been any Martian Chronicles. There almost certainly would not have been any Flash Gordon, Or "This Island Universe." Or "Fireball XL-5." Or Roger Ramjet...