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この長文がどんな話なのか理解できません😥
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We are,(to a remarkable degree, the right distance from the right sort of star, one e 5 of ten billion and we wouldn't be here now./ We are also fortunate to orbit where we that is big enough to radiate lots of energy, but not so big as to burn itself out swiftly t 1s a curiosity bf physics that the larger a stor the more rapidly it burns. Had our sun Ocen ten times as massive、it would have evhonsted itself after ten million years instead of do. 1o0 much nearer and evervthing on Farth would have boiled away. Much rarther away and everything would have frozen. の14 m 1978, an astrophysicist named Micheel Hart made some calculations and Concluded that Earth would have been uninhabitable had it been just 1 percent rartner That's not much, and in fact it wasn't enough. percent 10 from or 5.percent closer to the Sun. The figures have since been refined and made a little more generous 5 nearer and I5 percent farther are thought to be more accurate assessments 1oI om zone of habitability - but that is still a narrow belt. To appreciate just how narrow, you have only to look at Venus. Venus 1s only ©10 15 twenty-five million miles closer to the Sun than we are. The Sun's warmth reaches it just two minutes before it touches us. In size and composition, Venus is very like Earth, but the small difference in orbital distance made all the difference to (3)how it turned out. It appears that during the early years of the solar system Venus was only slightly warmer than Earth and probably had oceans. But those few degrees of extra 20 warmth meant that Venus could not hold on to its surface water, with disastrous consequences for its climate. As its water evaporated, the hydrogen atoms escaped into space, and the oxygen atoms combined with carbon to form a dense atmosphere of the greenhouse gas CO2. Venus became stifling. Although people of my age will recall a time when astrononmers hoped that Venus might harbor life beneath its padded 25 clouds, possibly even a kind of tropical vegetation, we now know that it is much too fierce an environment for any kind of life that we can reasonably conceive of. Its surface temperature is a roasting 470 degrees centigrade (roughly 900 degrees Fahrenheit), which is hot enough to melt lead, and the atmospheric pressure at the surface is ninety times that of Earth, or more than any human body could withstand We lack the technology to make suits or even spaceships that would allow us to visit Our knowledge of Venus's surface is based on distant radar imagery and som。 disturbing noise from an unmanned Soviet probe that was dropped hopefully into the
Aouds in 1972 and functioned for barely an hour before permanently shutting down. So that's what happens when you move twa light minutes closer to the Sun. Travel 1-61 farther out and the problem becomes not heat but cold, as Mars frigidly proves. It, 35 too, was once a much more congenial place, but couldn't retain a usable atmosphere and turned into a frozen waste.

回答

✨ ベストアンサー ✨

一段落目
我々(が住む地球)が他の星と適切な距離を保っていて、しかもその星も絶妙な大きさで、十分なエネルギーを発するけど、自ら燃え尽きたりしちゃうほどには大きすぎないから、その恩恵を受けて生きているという話。
もしそういう条件が違っていたらどうなるか、という仮定の話が多数。

二段落
一段落目の内容、地球と太陽の距離について1978年に天文学者が出した結論と、それについての評価

三段落
金星の事例。金星は、大きさや構成は地球に似ているけど地球より太陽に近い。
(注:水金地火木…だから、太陽系の惑星のなかで地球よりは太陽に近い。)
距離が近いので、太陽から受けるエネルギー量も地球より大きい。なので、金星は太陽系の歴史のなかで水を失ってしまい、それが金星の環境に大きな影響を与えている。21行目からはその具体例。
30行目〜 金星は人間が直接いけない環境なので、レーダーや無人探査機で調査している 的な話

四段落
前の段落では地球よりも太陽にひとつ近い、金星の話
逆に、地球よりも太陽に対してひとつ遠い火星の環境はどうか、という話。離れたら離れたでいろいろ問題が出てくる、的な感じ

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やっと理解出来ました!
ありがとうございます🙇🏽‍♀️✨

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