标签：小行星 相关文章
Dinosaurs Live Again at an American Museum 恐龙在美国博物馆再生 Many millions of years ago, the last dinosaurs lived in what is now the American West. Now, scientists studying dinosaur fossils have documented what happened to the ancient cr
2014年VOA慢速英语(十二)月
This is AP News Minute. A 28-year-old candidate who has never held public office stunned the democratic party by beating one of its house leaders. Alexandia Ocasio Cortez defeated Congressman Joe Crowley of New York, once thought of as a possible fut
美联社新闻一分钟2018(六)月
From the depths of space, an asteroid hurtles toward Earth. [Well, our general vicinity.] But this is no ordinary hunk of galactic debris. Because the body of this asteroid seems to defy gravity. Its bound by forces never observed on this scale in sp
2014年Scientific American(八)月
Dame Ellen MacArthur (born in 1976) is a very brave and talented English yachtswoman. Her first name is Ellen; Dame is a special title she received for her outstanding achievements from the British Queen. On 7 February 2005, she broke the world recor
各国名人英文介绍
Halfway there, you bump into the Asteroid Belt. It is not like in the movies where you are dodging asteroids at every second. It is a The space is very big and the asteroids are a long distance apart, so you could travel through it quite safely. The
自然百科2012年
Dad: What are you working on, honey? Mariko: Its a project for school about the Earth and its place in the universe. I have to write a report and build a model of what scientists can see with a telescope in space. Dad: I can help you with that. I was
地道美语播客
NASA Launches Mission To Retrieve Ancient Asteroid Dust play pause stop mute unmute max volume 00:0003:12repeat repeat off Update Required To play the media you will need to either update your browser to a recent version or update your Flash plugin.
2016年NPR美国国家公共电台9月
By Paul Sisco Washington, DC 07 July 2006 watch Asteroid report A major asteroid passed by the Earth this week, and another is heading this way. An asteroid visible in the night sky Asteroids are similar to comets and meteors. But they are larger, m
2006年VOA标准英语（七月）
Imagine boarding a flight to Saturn, what would you need to know before traveling? The best ringside vantage points? The must-see moons? Think of this as your personal guide to the splendor of the Saturnian system. A wandering spot of light twice as
自然百科2012年
Scientists are likening the new images from a large asteroid to discovery of a new world. Asteroid 21 Lutetia is located between Jupiter and Mars and the European Space Agency's probe Rosetta passed within about 2,000 miles of it, its onboard camera
自然百科2010年
There it is! Yep. Its about 90 kilometres up, at that stage, travelling at 17.5 kilometres per second. Using the different camera positions, scientists have pinpointed the exact position at which the meteor entered the atmosphere. And by tracking the
探索与发现2014年
So was this a near miss for us? If the asteroid had been in a different part of its orbit, so it didnt hit this year but it hit next year, it would have still hit us on February 15th. But instead of coming in over Russia, it would have come in over t
探索与发现2014年
On June 30th, 1908, a huge explosion tore through the forest of Tunguska, Siberia. It was 20 years before the Russians mounted an expedition to the site. What they found astonished them. 60 million trees across an area the size of London had been lev
探索与发现2014年
Most of the damage from an explosion like this is actually the blast wave. Its the very high winds. Mark created a simulation to see what size an asteroid would need to be to be able to generate such destructive power. In this simulation I include mo
探索与发现2014年
So this was serial number one. It was built during the Apollo time. I guess because they thought there would be several of them made, but this is the first one and the last one and is the only one like it in the world. This is NASAs Vertical Gun Rang
探索与发现2014年
Luckily, the very biggest asteroids are few and far between. But there are still plenty of rocks out there that represent a significant danger to us. So, at the summit of an extinct Hawaiian volcano, Professor Nick Kaiser and his colleagues are searc
探索与发现2014年
On 6th October 2008, asteroid hunter Richard Kowalski saw something that would change the assessment of threats presented by asteroid impacts. The night was proceeding normally and up on the screen came another asteroid. As I continued to make observ
探索与发现2014年
Meteor strikes as big as this may be rare butscientists have a surprisingly detailed knowledge of what meteorites are andwhere they come from. Long before the meteorite reached its explosivefinale in full view of Chelyabinsks dash cams, it had a very
探索与发现2014年
By collecting and comparing meteorites, scientistshave been able to piece together a picture of how they form and these studieshave revealed some of the most remarkable rocks in the solar system. Few places in the world have got as many meteoritesas
探索与发现2014年
S. African Scientists Claim Discovery of First Comet Strike 南非科学家发现首个彗星曾撞击地球的证据 JOHANNESBURG South African researchers say they have found conclusive evidence of earth's first-ever known comet strike, about 28 mi
VOA常速英语2013年(十月)