英语听力：探索发现 2014-05-23 BBC 地平线：陨石的真相-6

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

英语听力：探索发现 2014-05-21 BBC 地平线：陨石的真相-5

The explosion generated a shockwave so massive it wasdetected over 15,000 kilometres away. The low-frequency waves were picked up bymonitoring stations. So it is kind of like a listening network around theworld. Thats right. Theyre not set up for fir

英语听力：探索发现 2014-05-18 BBC 地平线：陨石的真相-4

Amazing images. But what can you get out of these asan expert? What it shows us, first of all, is a great record ofthe entry of the object into the Earths atmosphere. So you see it right fromthe moment it really penetrated. And there it is. That is t

英语听力：探索发现 2014-05-16 BBC 地平线：陨石的真相-3

I was shocked. I was truly shocked. I never thought Iwould see an event like this over a major city during my lifetime. We couldnt predict this was going to happen. The pieceof rock that actually entered the atmosphere was relatively small, maybe onl

英语听力：探索发现 2014-05-14 BBC 地平线：陨石的真相-2

This isnt the first time its happened. Over thelast few years, scientists have examined many other devastating impacts in theEarths past. Using this knowledge, I want to answer the key questions that theChelyabinsk meteor strike raises. Where did thi

英语听力：探索发现 2014-05-11 BBC 地平线：陨石的真相-1

For the residents of the Russian city of Chelyabinsk, the morning of Friday, February 15, 2013 began like any other. As they set off to work in what has become a craze throughout Russia, many recorded their journeys, but these cameras usually used fo

英语听力：探索发现 2014-05-09 Sex for Sale -23

In 1968, a Storey county judge ordered his brothel close and he wanted a thousand dollars per month for the next five months. Joe paid the thousand dollars but stayed open. He knows the police would come by and they didn't do anything and he thinks a

英语听力：探索发现 2014-05-07 Sex for Sale -22

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英语听力：探索发现 2014-05-04 Sex for Sale -21

Although lucrative, the world's oldest profession has often been outlawed. Currently prostitution is legal in 77 countries around the world. And although it's criminalized in 49 American states, in a few small counties in the state of Nevada, the sal

英语听力：探索发现 2014-05-30 BBC 地平线：陨石的真相-9

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

英语听力：探索发现 2014-05-28 BBC 地平线：陨石的真相-8

Well,the early reports are that it is an ordinary chondrite and that means it willbe similar to this one. So this is really exciting for us as scientists becausewe want to know how the planets formed, what was around before the planets, whatthe envir

英语听力：探索发现 2014-06-04 BBC 地平线：陨石的真相-10

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

英语听力：探索发现 2014-06-06 BBC 地平线：陨石的真相-11

Weknew from the radar measurements where Golevka was within a few tens of metres.And yet it was actually 12 or 15 kilometres away from where it was predicted tobe without Yarkovsky effect. So these very precise radar observations allowedus to see the

英语听力：探索发现 2014-06-08 BBC 地平线：陨石的真相-12

But there is a downside to Jupiter. It can also deflect asteroids into orbits that cross the Earths path. The Chelyabinsk meteor appears to be one of these typical Earth-crossing events. The likelihood is that it was thrown out of its regular orbit b

英语听力：探索发现 2014-07-13 BBC 地平线：陨石的真相-27

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

英语听力：探索发现 2014-07-11 BBC 地平线：陨石的真相-26

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

英语听力：探索发现 2014-07-09 BBC 地平线：陨石的真相-25

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

英语听力：探索发现 2014-07-06 BBC 地平线：陨石的真相-24

The meteorite was 15 kilometres across, enough to cause utter devastation across the whole planet. It exploded with a force of 100 million million tones of TNT. The blast sent a giant plume of vaporized rock out into space. A crater was punched 30 ki

英语听力：探索发现 2014-07-04 BBC 地平线：陨石的真相-23

As the divers have explored further, they discovered the Siluteis are actually part of a huge complex of tounels and caves.In fact, when you look from above, you can see Senluties scattered across hundreds of kilometers.And when they were mapped, it

英语听力：探索发现 2014-07-02 BBC 地平线：陨石的真相-22

Look at the size of this! This is magnificent! That is beautiful. This cave may be stunning, but it provides the evidence for one of the greatest catastrophes in the Earths history. And that water, its so clear! Lower the gear, please! Theres actuall