Word: arecibo
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Dates: during 1970-1979
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...achievement of Taylor and his colleagues, Peter M. McCulloch and Lee A. Fowler, was a triumph of radio astronomy. In 1974, while scanning the heavens with the giant bowl-shaped radio telescope near Arecibo, Puerto Rico, the researchers detected rhythmic radio signals from the constellation Aquila. The bursts were coming from a pulsar, or rapidly rotating neutron star-the incredibly compressed cadaver of a giant star whose nuclear fires have died out. Some 15,000 light-years away, it apparently was in orbit around a second compact object, perhaps another neutron star or even a black hole, whose gravity...
...eight hours at a velocity of 1.06 million k.p.h. (660,000 m.p.h.), would move ever closer, causing a shortening in their orbital period. The loss, to be sure, would be infinitesimal: only one ten-thousandth of a second per year, as determined from the pulses picked up by the Arecibo...
...will then radio the radar data back to earth, where scientists hope to produce a topographic map of 35% of the hidden Venusian surface showing details 100 meters (330 ft.) high and 16 km (10 miles) across. Earlier radar scans of the surface by the giant radio telescope at Arecibo, Puerto Rico, indicate that Venus is pockmarked with craters, possibly active volcanos and great lava flows...
...formations, analyze the composition of the clouds and measure the interaction between the "solar wind" and the atmosphere, Pioneer 1 will use radar to penetrate the clouds and produce a rough topographic map of much of the Venusian surface. Previous radar scans, made by the giant radio telescope in Arecibo, P.R., have already detected some craters, a large chasm, possible volcanoes, mountainous areas, and what seems to be a giant lava flow...
Follow-up examination by the giant radar antenna at Arecibo, Puerto Rico, quickly dispelled that notion. The radar data indicated that the landscape was littered with boulders ranging from 3 ft. to 15 ft. in diameter. Despite pressure from biologists anxious to begin Viking's life-seeking experiments, Martin decided that the risks at the second site were too great for the 1,270-lb., three-legged lander; to lose it on landing would leave the billion-dollar Viking mission totally dependent on Viking...