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雅思口语素材：space travel
雅思口语素材一：
Space travel is a form of travel in which passengers enter space, the vast region outside the protective envelope of the Earths atmosphere. Space starts 62 miles above the Earths crust, at a point called the Karman Line, and it continues for a distance that appears to be infinite, interrupted periodically by celestial bodies such as stars, planets, and so forth. Humans have long had romantic associations with traveling in space, with people consideringspace the final frontier, as they famously say on Star Trek. Humans have been intrigued by the night sky for centuries, tracking the movements of stars, planets, comets, and other features in the sky and pondering the mysteries of the heavens. In the 20th century, the fascination with space took on a whole new level of excitement when humans successfully launched manned spacecraft out of the Earths atmosphere, putting astronauts in space and on the Moon. With the proof that manned spaceflight was possible, the concept of space travel began to seem less like a pipe dream and more like a reality, and private companies began to enter the field, developing space planes and offering commercial flights. n the 20th century, travel in space was restricted to astronauts who worked for various governments, and it was primarily performed for research purposes. It allowed people to collect samples from the Moon, maintain space telescopes such as the Hubble Telescope, and eventually to perform research on the International Space Station, a structure that orbits the Earth and houses astronauts from several nations at any given time. While space travel for research is certainly admirable and important, many people are more interested in the potential for it as a form of recreation, tourism, or exploration. Civilians began purchasing tickets for tourist flights into space in the early 2000s, sometimes going on brief suborbital flights in which they barely entered space, and sometimes spending several days in space, exploring the International Space Station and enjoying the experience of being in space. The potential for space travel is infinite, just like the universe, bounded only by human technology. Many people hope that the dreams of science fiction, such as massive ships which can travel between galaxies, will someday be realized. People might explore the rest of the solar system and galaxy , learning more about the nature of the universe and potentially leading to a discovery of life beyond the boundaries of Earth.
雅思口语素材二：
Space Travel explains science, to help you make your fiction plausible. Youll engineer your rockets with accurate technical data. Show your characters physical responses to weightlessness. Know the environment of space, how inhospitable it is - and how its opening for business. Build an Earth-orbiting habitat for your storys setting. Discover our solar system ... and the staggering immensity of interstellar space. Consider the prospect of near-lightspeed travel. Imagine the conflicts, legal and military, your fictional missions might spark. In this book, youll see what is real today - and what may become real tomorrow.
雅思口语素材三：
Space travel bets on a dream. To design and build a spacecraft for space travel, you need to be able to figure out how big to make it, how heavy it can be, how fast it will have to go, how much fuel it needs and so forth. For that, you need a theory of how objects move in space and how to make the calculations. Over a period of nearly three centuries , three brilliant men - Johannes Kepler, Isaac Newton and Konstantin Tsiolkovsky, who said the Earth is the cradle of mankind - one cannot remain in the cradle forever, worked out almost all the theories of space flight. By 1951 space travel plans had become more grandiose. Famed rocket scientist Wernher von Braun predicted that a successful Mars mission could be accomplished with as few as 46 rockets in a round trip that would take three years. In a later interview with TIME, von Braun affirmed, Man belongs wherever he wants to go - and hell do plenty well when he gets there. The space age began in 1957 when the Soviet union launched Sputnik 1, the worlds first man-made satellite. Also in 1957, Sputnik 2 was launched carrying Laika, a dog that was the first animal to orbit the Earth. In 1961, Yuri Gagarin became the first person to pilot a spacecraft. In 1963, the United States and the Soviet union started a race to see who could put a man on the Moon first. In March of 1965, Alexei Leonov of the Soviet union left his spacecraft to become the first person to walk in space. On July 20, 1969, the United States won when Neil Armstrong and Buzz Aldrin landed on the Moons surface. The two superpowers have also put space stations into orbit around the Earth. These space structures serve as both a home and a laboratory for space travelers.