标签：行星 相关文章
But the friction and heat wears away at the space rock, the hot air actually melts the metal surface, and often the collision with the atmosphere can have a shattering effect, splitting the meteorites along fissures. This is an actual meteorite, and
探索与发现2014年
under [(1) below; (2) below the surface of; (3) less than; (4) as called for by a law, agreement or system] The river flows under the bridge. (1) The submarine went under. (2) The book was under 20 dollars. (3) Such action is not permitted under the
VOA慢速英语1500基础单词例句
Transcript (by myconsent) The European Space Agencys deep space probe Rosetta transmitted high-resolution images of an asteroid millions of miles from Earth. Rosetta caught up with the Steins Asteroid Friday night in the asteroid belt between the or
国家地理2008年
LOS ANGELES, April 8 (Xinhua) -- NASA's Wide-field Infrared Survey Explorer (WISE) has discovered a rare asteroid that traces out a horseshoe shape relative to Earth, the Jet Propulsion Laboratory (JPL) said on Friday. Unlike most near-Earth asteroid
英语新闻
汤博家乡庆祝冥王星探索 STREATOR, ILLINOIS Astronomer Clyde Tombaugh, born in rural Illinois in 1906, discovered what became the ninth planet in our solar system Pluto. Today, NASAs New Horizons spacecraft is providing the clearest images o
VOA标准英语2015年(十二月)
You Live In a Strange Solar System The more astronomers study the heavens, the more they realize: our solar system is weird.There are a few things that make the solar system kind of strange.Lauren Weiss, an astrophysicist at the University of Montrea
2018年科学美国人1月
【NPR边听边练】致力于提供新鲜有趣、饶有意味的时讯资料，致力于通过精听的方式促进听力提高，致力于不断开阔眼界和深入了解美国观点。 精听建议： 先完整地把一条新闻听一到三遍，争
NPR边听边练
Like a phoenix rising from the ashes, astronomers have found a whole new solar system may be forming in the wake of a star's violent death. This is the Hidden Universe of the Spitzer Space Telescope, exploring the mysteries of infrared astronomy with
自然百科2008年
Don: It's time once again for one of those Moments of Science that we like to call Never Thought to Ask.Our never thought to ask question for the day is: Why is the earth round? Ya?l: Why is the earth round? I never thought to ask that. D: Of course
英语时差8，16
The first pictures of Earth taken from space showed a solid ball covered by brown and green land masses and blue-green oceans. It appeared as if the Earth had always looked that way -- and always would. Scientists now know, however, that the surface
英语时差8，16
Tim has developed a map to visualize their location. And on that map, the most important are the Near-Earth asteroids, the ones closest to the planet. On the screen here is a map of the solar system. And Ive got the Sun in the centre and the third pl
探索与发现2014年
Heset out to investigate a hundred-year-old theory that said asteroids werepowered by the Sun itself. It was called the Yarkovsky effect. The Yarkovskyeffect is a very small acceleration and acts on asteroids and what it is is ifyou take a model, the
探索与发现2014年
Itsremarkable how we are able to build up this picture of whats going on millionsof miles away in the solar system. Its one of the joys of science really, justalmost like a detective picking up on those tiny clues to tell a bigger story. Sothat the b
探索与发现2014年
Water 'found on Mars' 火星上发现有水 The brine seepage is believed to be in Candor Chasm 咸水渗出物应该是在Candor Chasm There is currently water on the surface of Mars, Nasa scientists believe. The evidence is contained in pictures ta
双语有声阅读
Kepler Telescope's Planet-hunting Days End 开普勒望远镜危在旦夕 NASA is ending its attempts to restore the Kepler Space Telescope to full working order. The US space agency will now focus on analyzing the data collected over the past four y
VOA常速英语2013年(八月)
Searching the Heavens for Mountains In the last few decades, astronomers have discovered thousands of exoplanets orbiting other stars. Now, scientists want to know what they look like. Do they have oceans? Atmospheres? Researchers have even searched
2018年科学美国人3月
台湾籍旅美老师今天交给我们的句子是： Many scientists believe that the extinction of dinosaurs was caused by an asteroid the size of a small town crashing into what is now Mexicos Yucatan peninsula. 很多科学家认为恐龙的灭亡
留美老师带你每日说英文
Neil: This is Real English from BBC Learning English. I'm Neil. Lily: 大家好，我是杨莉。 Neil: This is the programme in which we look at words and phrases that you may not find in your dictionary. Lily: 地道英语和大家一起学习现代英
英语听力精选进阶版
In an exclusive interview with the BBC, Barack Obama has said the failure to tackle gun control has been the greatest frustration of his presidency. He said United States was the only advanced nation that did not have sufficient gun safety legislatio
英语听力精选进阶版
Billions of dollars have been wiped off stock marketsaround the world because growing concern aboutplunging oil prices and fears about economicslowdown. In New York, the Dow Jones Index close1.5% down. The main European stock exchanges slip to a 15 m
英语听力精选进阶版