Supermassive Black Holes 超大质量黑洞 - 9

Four times a year, Ghez focuses the telescope on the stars of the very heart of our Milky Way. She is looking for the telltale high speeds that reveal the presence of a black hole. The center of the M

Supermassive Black Holes 超大质量黑洞 - 8

In every galaxy scientists looked at, they found evidence for a supermassive black hole. NGC 3115 NGC 3377 NGC 3379 In M31 and M32 In total there is probably 20-30 or so black holes that have been fou

Supermassive Black Holes 超大质量黑洞 - 1

In March 2000, two astronomers made an extraordinary discovery, one that is set to overturn our understanding of how the universe formed. We're never going to see a time like this in astronomy again.

Supermassive Black Holes 超大质量黑洞 - 2

But we are just one in 125 billion galaxies of different shapes and sizes spinning through space. Yet scientists haven't been able to explain how a single one of these galaxies was created. Galaxy for

Supermassive Black Holes 超大质量黑洞 - 3

A supermassive black hole is quite simply gravity gone mad. An object of such concentrated matter its gravitational pull is insatiable. Nothing can escape it, not even light itself. Anything that gets

Supermassive Black Holes 超大质量黑洞 - 4

This ferocious heart of brilliant hot gas is called a quasar. Scientists thought this whirling mass might be caused by a giant black hole sucking up gas and stars, literally feeding on the center of a

Supermassive Black Holes 超大质量黑洞 - 5

By measuring how fast these stars were moving, he could prove if there really was a black hole at the center of an active galaxy. I picked a galaxy nearby which is called NGC 1068, an active galaxy, w

Supermassive Black Holes 超大质量黑洞 - 7

When it's feeding, a giant black hole creates a bright burning gas disk around it and then for some reason, it stops feeding, leaving a dark, deadly core lurking menacingly in the center of the galaxy

有声英文阅读-黑洞

Black Holes What is a black hole? Well, it's difficult to answer this question, since the terms we would normally use to describe a scientific phenomenon are inadequate here. Astronomers and scientist

双语有声阅读:Black Holes 黑洞

What is a black hole? Well, it's difficult to answer this question, since the terms we would normally use to describe a scientific phenomenon are inadequate here. Astronomers and scientists think that a black hole is a region of space (not a thing) i

Supermassive Black Holes 超大质量黑洞 - 12

This correlation is the most important thing we've learned about supermassive black hole so far. Astronomers are always looking for correlations. Whenever you find one that's really tight like this on

Supermassive Black Holes 超大质量黑洞 - 13

Silk realized that the energy from this newly formed quasar would create intense temperature changes in the surrounding gas. This would cause the gas around the black hole and its newly formed quasar

英语听力：2013-10-11 地平线：黑洞吞噬—10

It's like trying to pick out an individual inside the middle of a busy city, with lights and cars, and things happening all around them. But that wasn't the only problem. Vast, swirling clouds of dust and gas prevent visible light from the centre of

英语听力：2013-10-23 地平线：黑洞吞噬—15

It's clear that it will come very close to the black hole, might even hit the black hole. So maybe we actually are feeding the black hole here. Now exactly how much and how fast of all these is completely unknown and that's the excitement about it be

英语听力：2013-10-25 地平线：黑洞吞噬—16

To stare into the void of a black hole, to tumble through space before disappearing forever within it, it's the prospect of catching that unique moment that explains the excitement of this year's events. What happens to matter once it's been swallowe

英语听力：2013-10-30 地平线：黑洞吞噬—18

Here then is the strange paradox of black holes: the defeating black hole is anything but black. Just how greedy and bright a black hole can get is revealed by an aptly very ordinary looking galaxy called Cygnus A, some 650 million light years away.

英语听力：2013-11-01 地平线：黑洞吞噬—19

We now know this light is produced by the rotating disk of matter, spinning round the edge of the black hole at the heart of the Cygnus A galaxy, waiting to be devoured. It means that against all popular expectations, the brightest sources of light i

英语听力：2013-11-15 地平线：黑洞吞噬—25

Galaxies could in a way, be much bigger than they currently are. Something is stopping them growing larger and that something is the black hole at the center. Now this is bizarre because the ration of the size of the black hole to the size of the gal

英语听力：2013-11-17 地平线：黑洞吞噬—26

To walkhere on Earth, to be alive, it thanks to a long chain of cause and effect writtendeep into the structure of the universe. A primordial process so long, and soancient that on the scale of a human life it seems almost incomprehensible. One of th

英语听力：2013-11-22 地平线：什么害死了我们的蜜蜂—1

This summer, I set out to get to the bottom of a story thats captured the headlines. And this one, Ive got some experience myself, because Im also a beekeeper. There, is that good? Yeah, its perfect. Ok, I hate squeezing like that. I met some scienti