▶ Your Answer :
In the reading passage, there is ample support for the author's claim that the ashen light observed on Venus can have numerous possible roots such as a chemical procedure, the reflection of sunlight, and a glow by aurorae. However, the professor in the lecture gives several reasons as a rebuttal to the author's point. First, the professor contends that a chemical process in the atmosphere of Venus cannot result in the ashen light. This is because light produced by the chemical reaction between carbon monoxide and oxygen is able to emit only too faint one to be observed by simple telescopes, which were used by astronomers in the past. Thus, one could have made use of high-quality telescopes at that time to observe such light, if it had stemmed from a chemical reaction. This casts doubt on the reading passage's claim that carbon monoxide and oxygen split from carbon dioxide are flown with wind, and then bond with each other, thereby leading to the production of the ashen light. Next, the professor insists that sunlight reflection by Venus's atmosphere cannot be a true reason for the ashen light. Were the reflection a real origin, the ashen light would occur constantly because the sun (굳이 대문자로 쓸 이유는 없습니다) exposes light to Venus all the time. This is not in coincidence with the real observation that one can rarely see the ashen light. This refutes the reading passage's assertion that grossly reflective clouds with liquid sulfuric acid cover the whole surface of Venus, and they reflect light from the Sun, thereby giving rise to the ashen light. Finally, the professor argues that aurorae in Venus cannot bring about the ashen light. Since aurorae are formed due to the magnetic field of a planet, they cannot be made in Venus which produces no such field. Therefore, aurorae do not happen in Venus and cannot be the origin of the ashen light obviously. This counters the reading passage's suggestion that aurorae that originate from collisions between plasma from the sun and atoms in the atmosphere of Venus result in visible light, which is the root of the ashen light. |