Word: space
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Dates: during 1970-1979
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...other alternative than to adjust American response to "the new realities" of world power. That, however, is a difficult thought to assimilate in a nation so rich and capable. Worried about the national spirit, Author James Michener was in town a few days ago to urge further space exploration. He eloquently posed the longer concern that is now in our national dialogue: "There seem to be great tides which operate in the history of civilization, and nations are prudent if they estimate the force of those tides, their genesis and the extent to which they can be utilized. A nation...
...modern Merlin, conjuring up astonishing new notions of space and time, changing forever man's perception of his universe ?and of himself. He fathered relativity and heralded the atomic age with his famed formula E=mc2. Yet his formidable reputation never undermined his simple humanity. He spoke out courageously against social injustice. In his later years, dressed in baggy clothes, his white hair as unkempt as a sheep dog's, he helped yourgsters with their geometry homework, still loved to sail, play Mozart melodies on the violin and scribble reams of doggerel. Though he has been dead nearly...
Since the early 1960s, astronomers have been opening up an entirely new universe, aided by technology only vaguely dreamed of in Einstein's day: giant radio antennas that can "see" hitherto unknown sources of energy in space, orbiting satellites that scan the heavens high above the obscuring atmosphere, and atomic clocks so accurate they lose or gain barely a billionth of a second in a month...
...boldly disregarded the notion of the ether. Then he went on to state two postulates: 1) An experiment can detect only relative motion, that is, the motion of one observer with respect to an other. 2) Regardless of the motion of its source, light always moves through emp ty space at a constant speed (this seems to violate common sense, which suggests that light projected forward from a moving spacecraft, like a bullet fired from a plane, would travel at a speed equal to its velocity plus that of the craft). From these statements, using thought experiments and simple mathematics...
These seemingly contradictory effects lead to a famous brain teaser called the Twin Paradox: If one twin goes off into space, which twin will be the older (if either is) when the brothers are reunited...