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지문 분석결과
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영어2 YBM(한) 5~8과
영어2 YBM(한) 5~8과
영어2 YBM(한) 5~8과
본문 5과-5
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지문 전체 문장
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본문 5과-5
What about gravity? On Earth, gravity has been thought to be necessary for roots to grow in the right direction—down and away from the leaves. In a weightless environment, there is no up or down, so roots grow in all directions. Research done in 2010 on the ISS, however, showed that gravity is not an important factor for plant growth. This research proved that plants do not need gravity in order to grow normal root patterns and send their leaves upward toward the light. Plants grow more slowly, but as long as they have a light source above them, they are able to grow in the right direction. The light source, however, needs to be sufficiently strong and directed. This intense light source is indispensable for photosynthesis. On Earth, most plants get this light from an obvious, abundant source, the sun. But in a spacecraft, the sun's solar radiation is usually not best for plant growth because the position of the vehicle is constantly changing. Thus, NASA has adopted LEDs for the light source. LEDs use less energy and last longer than old-fashioned lights. LEDs emit little heat, so moving them closer to the plants won't cause the plants to dry out or be burned. Knowing how to grow plants in confined spaces is not just of benefit to salad-hungry astronauts. Experiments with plant production on the ISS have also proven valuable for agriculture on Earth, especially for areas in which water is scarce, soil is poor, or space is limited. For example, vertical farming with an electric light source is now widely used in many countries. Continued experiments in space gardening will give more insight into how plants can be grown successfully in challenging environments. Space gardening is good not only for astronauts in space but also for people on Earth, helping to solve the problems of how to face a changing climate and a growing world population.
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1 What about gravity? 2 On Earth, gravity has been thought to be necessary for roots to grow in the right direction—down and away from the leaves. 3 In a weightless environment, there is no up or down, so roots grow in all directions. 4 Research done in 2010 on the ISS, however, showed that gravity is not an important factor for plant growth. 5 This research proved that plants do not need gravity in order to grow normal root patterns and send their leaves upward toward the light. 6 Plants grow more slowly, but as long as they have a light source above them, they are able to grow in the right direction. 7 The light source, however, needs to be sufficiently strong and directed. 8 This intense light source is indispensable for photosynthesis. 9 On Earth, most plants get this light from an obvious, abundant source, the sun. 10 But in a spacecraft, the sun's solar radiation is usually not best for plant growth because the position of the vehicle is constantly changing. 11 Thus, NASA has adopted LEDs for the light source. 12 LEDs use less energy and last longer than old-fashioned lights. 13 LEDs emit little heat, so moving them closer to the plants won't cause the plants to dry out or be burned. 14 Knowing how to grow plants in confined spaces is not just of benefit to salad-hungry astronauts. 15 Experiments with plant production on the ISS have also proven valuable for agriculture on Earth, especially for areas in which water is scarce, soil is poor, or space is limited. 16 For example, vertical farming with an electric light source is now widely used in many countries. 17 Continued experiments in space gardening will give more insight into how plants can be grown successfully in challenging environments. 18 Space gardening is good not only for astronauts in space but also for people on Earth, helping to solve the problems of how to face a changing climate and a growing world population.