高中Unit 4 Space Exploration课文课件ppt

这是一份高中Unit 4 Space Exploration课文课件ppt，共16页。PPT课件主要包含了outward ，astronomy ，话题延伸等内容，欢迎下载使用。
Listening and Speaking
[思维激活]从网络上搜索歌曲，根据所听内容，在下面歌词空格处填入正确的单词。The Bing Bang Thery ThemeOur whle universe was in a ht dense stateThen nearly furteen billin years ag expansin Earth began t clThe auttrphs began t drlNeanderthals develped tls
We built a wall (we built the pyramids)Math, science, histry, unraveling the mysteriesThat all started with the big bang“Since the dawn f man” is really nt that lngAs every galaxy was frmed in less time than it takes t sing this sngA fractin f a secnd and the elements were madeThe bipeds ①____________________The dinsaurs all met their fateThey tried t leap but they were lateAnd they all died (they frze their asses ff)
std up straight
The ceans and pangeaSee ya, wuldn't wanna be yaSet in mtin by the same big bang!It all started with the big BANG!It's expanding ever ②____________ but ne dayIt will cause the stars t g the ther wayCllapsing ever inward, we wn't be here, it wn't be hurtOur best and brightest figure that it'll make an even bigger bang!Australpithecus wuld really have been sick f us
Debating ut while here they're catching deer (we're catching viruses)Religin r ③____________， Encarta, DeuternmyIt all started with the big bang! Music and mythlgy, Einstein and astrlgyIt all started with the big bang!It all started with the big BANG！　　　　
在网上查阅一些资料后用英语向你的同学介绍一下太阳。________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
Example：The Sun’s Energy The sun, ur singular surce f renewable energy, sits at the center f the slar system and gives ut energy at an extremely large and relatively cnstant rate, 24 hurs per day, mre than 360 days f the year. If we culd harvest the energy cming frm just 10 hectares (25 acres) f the surface f the sun, we wuld have enugh t supply the current energy demand f the wrld.
Hwever, there are three imprtant reasns why this cannt be dne. First, the earth is displaced frm the sun, and since the sun's energy spreads ut like light frm a candle, nly a small amunt f the energy leaving an area f the sun reaches an equal area n the earth. Secnd, the earth turns abut its plar axis (极轴), s that any cllectin device lcated n the earth's surface can receive the sun's energy fr nly abut ne­ half f each day. The third and least factr is the cnditin f the thin shell f atmsphere that surrunds
the earth’s surface. At best the earth’s atmsphere accunts fr anther 30 percent reductin in the sun’s energy. As is widely knwn, hwever, the weather cnditins can stp all but a minimal amunt f slar radiatin frm reaching the earth’s surface fr many days in a rw.
2.课外阅读 We find that the mn is abut 239,000 miles (384,551 km) away frm the earth, and, t within a few thusand miles, its distance always remains the same. Yet a very little bservatin shws that the mn is nt standing till. Its distance frm the earth remains the same, but its directin cntinually changes. We find that it is traveling in a circle—r very nearly a circle—rund the earth, ging cmpletely rund nce a mnth, r, mre exactly, nce every 27 and 1/3 days. It is ur nearest neighbr in space, and like urselves it is kept tied t the earth by the earth's gravitatinal pull.
Except fr the sun, the mn lks the biggest bject in the sky. Actually it is ne f the smallest, and nly lks big because it is s near t us. Its diameter is nly 2,160 miles (3,476 km), r a little mre than a quarter f the diameter f the earth. Once a mnth, r, mre exactly, nce every 29 and 1/2 days, at the time we call “full mn”， its whle disc lks bright. At ther times nly part f it appears bright, and we always find that this is the part which faces twards the sun, while the part facing away frm the sun appears dark. Artists culd make their pictures better if they kept this in mind—nly thse parts f the mn which are lighted up by the sun are bright. This shws that the mn gives n light f its wn. It merely reflects the light f the sun, like a huge mirrr hung in the sky.
我们发现月球距离地球大约239 000英里（384 551公里），在几千英里范围内，它的距离始终保持不变。然而，很小（角度）的观察表明，月球并不是静止的。它与地球的距离保持不变，但它的方向不断变化。我们发现它绕着地球转圈，或者几乎是一个圆，一圈转一月，或者更确切地说，一圈27又1/3天。它是我们在太空中最近的邻居，和我们一样，它被地球的引力束缚在地球上。 除了太阳，月亮看起来是天空中最大的物体。实际上它是最小的，看起来很大是因为它离我们太近了。它的直径只有2 160英里（3 476公里），也就是地球直径的四分之一多一点。
一个月一次，或者更确切地说，每29.5天一次，在我们称之为“满月”的时候，它的整个圆盘看起来很亮。在其他时候，只有一部分看起来是明亮的，我们总是发现这是面向太阳的部分，而不面向太阳的部分看起来是黑暗的。如果艺术家们能记住这一点，他们的画就会变得更好——只有那些被太阳照亮的月球部分才是明亮的。这表明月球本身不发光。它只是反射太阳光，就像挂在天空中的一面大镜子。
词海拾贝1．bservatin n. 观察2．cntinually adv. 持续地3．gravitatinal adj. 引力的；重力引起的4．diameter n. 直径；对径；放大率；放大倍数