The rocket, which has played a crucial part in the revolution of military technology since the end of World War II, acquired a more constructive significance in the U.S. and Soviet space programs. The first spectacular step was Sputnik 1, a sphere with an instrument package weighing 184 pounds (83 kilograms), launched into space by the Soviets on Oct. 4, 1957, to become the first artificial satellite. The feat precipitated the so-called space race, in which achievements followed each other in rapid succession. They may be conveniently grouped in four chronological although overlapping stages.
The first stage emphasized increasing the thrust of rockets capable of putting satellites into orbit and on exploring the uses of satellites in communications, in weather observation, in monitoring military information, and in topographical and geological surveying.
The second stage was that of the manned space program. This began with the successful orbit of the Earth by the Soviet cosmonaut Yury Gagarin on April 12, 1961, in the Vostok 1. This flight demonstrated mastery of the problems of weightlessness and of safe reentry into the Earth’s atmosphere. A series of Soviet and U.S. spaceflights followed in which the techniques of space rendezvous and docking were acquired, flights up to a fortnight were achieved, and men “walked” in space outside their craft.
The third stage of space exploration was the lunar program, beginning with approaches to the Moon and going on through automatic surveys of its surface to manned landings. Again, the first achievement was Soviet: Luna 1, launched on Jan. 2, 1959, became the first artificial body to escape the gravitational field of the Earth, fly past the Moon, and enter an orbit around the Sun as an artificial planet. Luna 2 crashed on the Moon on Sept. 13, 1959; it was followed by Luna 3, launched on Oct. 4, 1959, which went around the Moon and sent back the first photographs of the side turned permanently away from the Earth. The first soft landing on the Moon was made by Luna 9 on Feb. 3, 1966; this craft carried cameras that transmitted the first photographs taken on the surface of the Moon. By this time excellent close-range photographs had been secured by the United States Rangers 7, 8, and 9, which crashed into the Moon in the second half of 1964 and the first part of 1965; and between 1966 and 1967 the series of five Lunar Orbiters photographed almost the entire surface of the Moon from a low orbit in a search for suitable landing places. The U.S. spacecraft Surveyor 1 soft-landed on the Moon on June 2, 1966; this and following Surveyors acquired much useful information about the lunar surface. Meanwhile, the size and power of launching rockets climbed steadily, and by the late 1960s the enormous Saturn V rocket, standing 353 feet (108 metres) high and weighing 2,725 tons (2,472,000 kilograms) at lift-off, made possible the U.S. Apollo program, which climaxed on July 20, 1969, when Neil Armstrong and Edwin Aldrin clambered out of the Lunar Module of their Apollo 11 spacecraft onto the surface of the Moon. The manned lunar exploration thus begun continued with a widening range of experiments and achievements for a further five landings before the program was curtailed in 1972.
U.S. weather satellite orbiting the Earth.NASA
The fourth stage of space exploration looked out beyond the Earth and the Moon to the possibilities of planetary exploration. The U.S. space probe Mariner 2 was launched on Aug. 27, 1962, and passed by Venus the following December, relaying back information about that planet indicating that it was hotter and less hospitable than had been expected. These findings were confirmed by the Soviet Venera 3, which crash-landed on the planet on March 1, 1966, and by Venera 4, which made the first soft landing on Oct. 18, 1967. Later probes of the Venera series gathered further atmospheric and surficial data. The U.S. probe Pioneer Venus 1 orbited the planet for eight months in 1978, and in December of that year four landing probes conducted quantitative and qualitative analyses of the Venusian atmosphere. Surface temperature of approximately 900 °F reduced the functional life of such probes to little more than one hour.
Research on Mars was conducted primarily through the U.S. Mariner and Viking probe series. During the late 1960s, photographs from Mariner orbiters demonstrated a close visual resemblance between the surface of Mars and that of the Moon. In July and August 1976, Vikings 1 and 2, respectively, made successful landings on the planet; experiments designed to detect the presence or remains of organic material on the Martian surface met with mechanical difficulty, but results were generally interpreted as negative. Photographs taken during the early 1980s by the U.S. probes Voyagers 1 and 2 permitted unprecedented study of the atmospheres and satellites of Jupiter and Saturn and revealed a previously unknown configuration of rings around Jupiter, analogous to those of Saturn.
In the mid-1980s the attention of the U.S. space program was focused primarily upon the potentials of the reusable space shuttle vehicle for extensive orbital research. The U.S. space shuttle Columbia completed its first mission in April 1981 and made several successive flights. It was followed by the Challenger, which made its first mission in April 1983. Both vehicles were used to conduct myriad scientific experiments and to deploy satellites into orbit. The space program suffered a tremendous setback in 1986 when, at the outset of a Challenger mission, the shuttle exploded 73 seconds after liftoff, killing the crew of seven. The early 1990s saw mixed results for NASA. The $1.5 billion Hubble Space Telescope occasioned some disappointment when scientists discovered problems with its primary mirror after launch. Interplanetary probes, to the delight of both professional and amateur stargazers, relayed beautiful, informative images of other planets.
At the dawn of the space age it is possible to perceive only dimly its scope and possibilities. But it is relevant to observe that the history of technology has brought the world to a point in time at which humankind, equipped with unprecedented powers of self-destruction, stands on the threshold of extraterrestrial exploration. Perceptions of technology Science and technology
Among the insights that arise from this review of the history of technology is the light it throws on the distinction between science and technology. The history of technology is longer than and distinct from the history of science. Technology is the systematic study of techniques for making and doing things; science is the systematic attempt to understand and interpret the world. While technology is concerned with the fabrication and use of artifacts, science is devoted to the more conceptual enterprise of understanding the environment, and it depends upon the comparatively sophisticated skills of literacy and numeracy. Such skills became available only with the emergence of the great world civilizations, so it is possible to say that science began with those civilizations, some 3,000 years bce, whereas technology is as old as humanlike life. Science and technology developed as different and separate activities, the former being for several millennia a field of fairly abstruse speculation practiced by a class of aristocratic philosophers, while the latter remained a matter of essentially practical concern to craftsmen of many types. There were points of intersection, such as the use of mathematical concepts in building and irrigation work, but for the most part the functions of scientist and technologist (to use these modern terms retrospectively) remained distinct in the ancient cultures.
The situation began to change during the medieval period of development in the West (500–1500 ce), when both technical innovation and scientific understanding interacted with the stimuli of commercial expansion and a flourishing urban culture. The robust growth of technology in these centuries could not fail to attract the interest of educated men. Early in the 17th century the natural philosopher Francis Bacon recognized three great technological innovations—the magnetic compass, the printing press, and gunpowder—as the distinguishing achievements of modern man, and he advocated experimental science as a means of enlarging man’s dominion over nature. By emphasizing a practical role for science in this way, Bacon implied a harmonization of science and technology, and he made his intention explicit by urging scientists to study the methods of craftsmen and urging craftsmen to learn more science. Bacon, with Descartes and other contemporaries, for the first time saw man becoming the master of nature, and a convergence between the traditional pursuits of science and technology was to be the way by which such mastery could be achieved.