- 下半年大學(xué)生英語(yǔ)六級(jí)聽(tīng)力考試模擬題 推薦度：
- 相關(guān)推薦
2017英語(yǔ)六級(jí)考試聽(tīng)力模擬題
有的同學(xué)一提到考試就頭疼,腦大,其實(shí)大家不用害怕,只要大家用心,多做題,就一定會(huì)有好的成績(jī)。以下是小編為大家搜索整理的2017英語(yǔ)六級(jí)考試聽(tīng)力模擬題，希望能給大家?guī)?lái)幫助!更多精彩內(nèi)容請(qǐng)及時(shí)關(guān)注我們應(yīng)屆畢業(yè)生考試網(wǎng)!
When NASA launched the Kepler Space Telescope in 2009, scientists learned something new - and quite significant, says the director of the Space Telescope Science Institute, Matt Mountain.
“Our galaxy has at least 100 billion planets in it.
And we didn't know that five years ago," said Mountain.
Of course, Kepler and today's other powerful telescopes cannot actually see those planets; they are too faint against the light of their stars.
But scientists can measure the change of light when they pass in front of the star and analyze the light passing through their atmosphere to determine what is in it.
“Well, if we were looking at Earth, we would see signs of our sky, our blue sky, we would see signs of oxygen, of carbon-dioxide, of sulfur dioxide from volcanoes and we might even see signatures that there was plant life," said NASA's astrophysicist and former astronaut John Grunsfeld. "And we see that by dissecting the light into its component colors."
Most of the planets discovered so far are unlike Earth. They are too big, too small, too close to their sun, or too far away to support life. But astrophysicist Sara Seager says small planets the size of Earth are extremely common.
“We're looking for biological signatures, gasses that are produced by life, gasses that don't belong in the atmosphere," said Seager.
In cooperation with the European Space Agency and scientists from other nations, NASA is building the next generation of space telescopes that may be able to find evidence of life.
The James Webb Space Telescope, scheduled to be deployed in 2018, will have unprecedented sensitivity and resolution that will greatly improve the spectroscopic analysis of distant stars and planets.
NASA’s chief scientist Ellen Stofan says the agency also plans to look for life on Jupiter’s moon Europa, which may have an ocean under its ice cover.
“In our own solar system we know where to go, we know what to measure it and we're in the process of doing just that. Looking out, beyond our solar system, we're on the right track, we're making the right measurements and we're just on the cusp of learning so much," said Stofan.
Scientists say there's a very high probability that they will find a planet very much like Earth. That could help answer the question: how hard is it for life to get a foothold in the universe?
【英語(yǔ)六級(jí)考試聽(tīng)力模擬題】相關(guān)文章：
英語(yǔ)六級(jí)聽(tīng)力考試鞏固試題05-25
英語(yǔ)六級(jí)聽(tīng)力考試誤區(qū)及技巧10-18
英語(yǔ)六級(jí)聽(tīng)力考試技巧分享06-18
2017下半年大學(xué)生英語(yǔ)六級(jí)聽(tīng)力考試模擬題07-28
英語(yǔ)六級(jí)考試聽(tīng)力課堂筆記07-16
英語(yǔ)六級(jí)聽(tīng)力考試樣題訓(xùn)練07-18
英語(yǔ)六級(jí)考試聽(tīng)力高分技巧07-29