首页
登录
职称英语
[originaltext] We are going to start a study of sunspots today, and I think
[originaltext] We are going to start a study of sunspots today, and I think
游客
2024-04-12
21
管理
问题
We are going to start a study of sunspots today, and I think you’ll find it rather interesting. Now I’m going to assume that you know that sunspots, in the most basic terms, are dark spots on the Sun’s surface. That will do for now. The ancient Chinese were the first to record observations of sunspots as early as the year 165. When later European astronomers wrote about sunspots, they didn’t believe that the spots were actually on the Sun. That’s because of their belief at the time that the heavenly bodies, the Sun, Moon, Stars, and Planets, were perfect, without any flaws or blemishes. So the opinion was the spots were actually something else, like shadows of planets crossing the Sun’s face. And this was the thinking of European astronomers until the introduction of the telescope, which brings us to our old friend, Galileo. In the early 1600s, based on his observations of sunspots, Galileo proposed a new hypothesis. He pointed out that the shape of sunspots, well, the sunspots weren’t circular. If they were shadows of the planets, they would be circular, right? So that was a problem for the prevailing view. And he also noticed that the shape of the sunspots changed as they seemed to move across the Sun’s surface. Maybe a particular sunspot was sort of square, then later it would become more uneven, then later something else. So there is another problem with the shadow hypothesis, because the shape of a planet doesn’t change.
What Galileo proposed was that sunspots were indeed a feature of the Sun, but he didn’t know what kind of feature. He proposed that they might be clouds in the atmosphere, the solar atmosphere, especially because they seemed to change shape and there was no predicting the changes, at least nothing Galileo could figure out. That random shape changing would be consistent with the spots being clouds. Over the next couple hundred years, a lot of hypotheses were tossed around. The spots were mountains or holes in the solar atmosphere through which the dark surface of the Sun could be seen. Then in 1843, an astronomer named Heinrich Schwa Trobe made an interesting claim. He had been watching the Sun every day that it was visible for 17 years, looking for evidence of a new planet. And he started keeping tracks of sunspots, mapping them, so he wouldn’t confuse them, so he wouldn’t confuse them with any potential new planet. In the end, there was no planet, but there was evidence that the number of sunspots increased and decreased in a pattern, a pattern that began repeating after 10 years, and that was a huge breakthrough.
22. Why didn’t European astronomers believe that there are sunspots ?
23. What is Galileo’s new hypothesis?
24. According to Galileo’s view, what was the shape of sunspots?
25. What is Heinrich Schwa’s finding?
选项
A、Square.
B、Triangular.
C、Circular.
D、Random.
答案
D
解析
讲座后面提到伽利略认为太阳黑子的形状经过太阳表面时会发生变化。可能某个特殊的太阳黑子是方的,然后变得更加不规则,再然后就变成另外一个样子了,因此D项“无规则的”为正确答案。因为黑子是随机变化的,所以有时会变成A项“方的”,但不是固定是方的,有时候变得不规则。伽利略认为黑子不是圆形的(the shape of sunspotswasn’t circular),故C项不选;B项“三角形”在录音中没有提及,不选。
转载请注明原文地址:https://tihaiku.com/zcyy/3552574.html
相关试题推荐
[originaltext]Wearegoingtostartastudyofsunspotstoday,andIthink
[originaltext]Wearegoingtostartastudyofsunspotstoday,andIthink
[originaltext]Playisveryimportantforhumansfrombirthtodeath.Playi
[originaltext]Playisveryimportantforhumansfrombirthtodeath.Playi
[originaltext]Mostschoolsoffermusicandartclassestogivestudentsaw
[originaltext]Mostschoolsoffermusicandartclassestogivestudentsaw
[originaltext]Lipstickplaysanimportantroleinsexualattractionandcan
[originaltext]POLICEintheUKhavelaunchedastopandsearchprogramarou
[originaltext]POLICEintheUKhavelaunchedastopandsearchprogramarou
[originaltext]W:Iseeyouarehavingthefishforlunch.M:That’sright.Fish
随机试题
Animationmeansmakingthingswhicharelifelesscomeliveandmove.Sincee
DaretoDreamOurdreamsatnight
Youcan【B1】_______tothesightoftheworld’sski【B2】_______【B3】_______—y
塔式起重机严禁在夜间进行安装作业。()
A. B. C. D.
患者女性,38岁,反复口腔溃疡7年,伴间断四肢大关节游走性肿痛,近1周自觉左眼视
调解劳动争议应贯彻自愿原则,具体包括()A:申请调解自愿 B:接受调解自愿
()是不同市场之间债券的互换。A:替代互换B:市场间利差互换C:互补互换D
期货从业人员在从事期货业务前应具备( )。A.专业技能 B.专业知识 C.
下列选项中,项目监理机构在施工阶段造价控制的主要任务有()。A.预防并处理费用索
最新回复
(
0
)