英语听力：自然百科 已知的宇宙：外星生命 Alien_Contact-2
时间：2019-01-22 作者：英语课 分类：自然百科2010年
英语课
Are we alone ?And it ties into all the big questions: how do we get here ? where are we going ?Are we a part of a bigger picture?
But for the longest time ,the question was taboo to science .
Before the Mid-1990s ,it was considered somewhat embarassing to even address the question, because looking for alien life seems a little frighteningly close to science fiction .
For decades ,the farthest we got in looking for aliens was imagining them on the silver screen .(What is your name?) After all , alien life needs a hull 1, and we havn't even find a planet outside our own solar system .
Scientists in fact never talked about planets around other stars. There is no way to detect them. And so it was one of those domains 2 of science that you couldn't answer and therefore you didn't talk about it.
Then in 1995, astronomers 3 discovered a planet orbiting a star 50 light-years from earth. And since then they found hundreds more .
For the first time, in human history ,we realized that our sun with its 8 major planets that go around it, is just one type of a planetary system ,one example of billlions.
These discoveries are exciting ,but don't expect to dial up ET on these planets anytime soon .
Well ,it's been a spectacular ride in the last decade to find these planets ,most of them are giant planets.
Most of the worlds we found are gas giants which probably couldn't support life .
You can't stand on pneumas ,no hard surface,they are large balls of hydrogen and helium gas like Jupiter and Saturn 4 .
We have found a few rocky planets with hard surfaces ,but they are many times more massive than earth ,and contain the most hostile environments you could ever imagine. One such planet, CoRoT-7b,orbits so close to its star that / surface temperatures reach as high as 3000 degrees .Sunlights here does not bring the sound of birds' song ,instead it's an Armageddon of volcanic 5 explosions .
n.船身；(果、实等的)外壳；vt.去(谷物等)壳
- The outer surface of ship's hull is very hard.船体的外表面非常坚硬。
- The boat's hull has been staved in by the tremendous seas.小船壳让巨浪打穿了。
n.范围( domain的名词复数 )；领域；版图；地产
- The theory of thermodynamics links the macroscopic and submicroscopic domains. 热力学把宏观世界同亚微观世界联系起来。 来自辞典例句
- All three flow domains are indicated by shading. 所有三个流动区域都是用阴影部分表示的。 来自辞典例句
n.天文学者，天文学家( astronomer的名词复数 )
- Astronomers can accurately foretell the date,time,and length of future eclipses. 天文学家能精确地预告未来日食月食的日期、时刻和时长。 来自《简明英汉词典》
- Astronomers used to ask why only Saturn has rings. 天文学家们过去一直感到奇怪，为什么只有土星有光环。 来自《简明英汉词典》
n.农神，土星
- Astronomers used to ask why only Saturn has rings.天文学家们过去一直感到奇怪，为什么只有土星有光环。
- These comparisons suggested that Saturn is made of lighter materials.这些比较告诉我们，土星由较轻的物质构成。