官方APP下载:英语全能特训(微信小程序版,支持苹果手机、安卓手机)
创办于2003年
UNSV记不住?那就记中文谐音“忧安思危”吧!
  Slow and Steady Wins the Race!
UNSV英语学习频道 - Slow and steady wins the race!
van allen站长就要结婚了!终身vip会员特惠活动进行中 >>>
手机微信学英语
打开手机微信,扫描以下二维码,即可通过我们的微信小程序学英语。
英语全能特训(微信小程序)
UNSV英语学习频道淘宝网店
淘宝网店购买咨询
客服短信:18913948480
客服邮箱:web@unsv.com
初级VIP会员
全站英语学习资料下载。
¥98元/12个月
终身VIP会员
一次购买,终身使用。
¥1990元/终身

Scientists Release First-Ever Image of Black Hole 科学家发布人类史上首张黑洞照片!

阅读次数:

免费会员开放下载 MP3节目录音 MP3节目录音  .txt格式文本
下载提示:鼠标右键点击下载链接,然后选择“目标另存为”。
站长婚礼祝福VIP会员优惠活动正在进行中,点此立即优惠购买!
VIP会员专享下载:(非VIP会员无权下载!如果想下载,但还不是VIP会员,请点此订购
下载方式:使用鼠标右键(注意是鼠标右键!)点击下面的MP3音频/MP4视频链接,然后选择“另存为…”。
MP3同步字幕 MP3同步字幕 
文章原文
同步字幕

An international team of astronomers announced Wednesday it had successfully captured the first-ever image of a black hole.

The image was released during a press event at the National Science Foundation in Washington, D.C. Press events were also held in several other world cities.

The picture shows the black hole having a dark center, encircled by a bright orange and yellow ring spreading outward. The image is very similar to numerous artists' drawings through the years of what scientists believed a black hole looked like.

Black holes are areas in space where gravity is so strong that nothing – not even light – can escape them. They are believed to be formed by collapsed stars. The presence of black holes affects the surrounding environment in extreme ways.

Black holes are not easy to capture on camera because they are surrounded by thick dust material and extremely hot gases.

A supermassive black hole with millions to billions times the mass of our sun is seen in an undated NASA artist's concept illustration.
A supermassive black hole with millions to billions times the mass of our sun is seen in an undated NASA artist's concept illustration.

But scientists say they were able to produce the new image from data collected from a series of radio telescopes around the world. The telescopes are part of the international Event Horizon Telescope (EHT) project.

Harvard University scientist Sheperd Doeleman leads the EHT project. He announced the image discovery.

'We are delighted to be able to report to you today that we have seen what we thought was unseeable. We have seen and taken a picture of a black hole. Here it is.'

Doeleman explained that the image resulted from a combined effort involving all eight of the EHT radio telescopes working at the same time. Over several days in April 2017, each piece of equipment centered on a galaxy 55 million light years away from Earth.

The galaxy is called Messier 87, or M87. At the center of the galaxy is a supermassive black hole. The new image shows this black hole. It has a mass 6.5 billion times greater than Earth's sun.

Researchers said in a statement that the EHT project created an Earth-sized "virtual telescope" to capture the highest possible image quality. The effort involved years of international cooperation by hundreds of researchers seeking to understand "the most extreme objects in the Universe."

Dimitrios Psaltis is an EHT project scientist from the University of Arizona in Tucson. He said the new picture provides strong evidence to support Albert Einstein's theories relating to the laws of gravity.

'The size and shape of the shadow matches the precise predictions of Einstein's general theory of relativity, increasing our confidence in this century-old theory," Psaltis said.

Three years ago, scientists used highly sensitive observing equipment to pick up the sound of two smaller black holes coming together to create a gravitational wave. That discovery also confirmed Einstein's theory.

Sheperd Doeleman said the new image provides the first visual evidence to confirm that theory. It also helps to unlock the mystery of black holes. He added that he felt very satisfied that the image did not contain any big surprises.

'You could have seen something that was unexpected, but we didn't see something that was unexpected. We saw something so true. We saw something that really had a ring to it, if you can use that term or phrase.'

Even though the data was first gathered in 2017, it required a huge effort to produce the image released on Wednesday. The operation involved an international team of scientists using supercomputers to process massive amounts of data.

Jessica Dempsey is deputy director of the East Asian Observatory in Hawaii and a co-discoverer in the project. "We've been hunting this for a long time," she said of the new black hole image. "We've been getting closer and closer with better technology," she added.

I'm Bryan Lynn.

Quiz - Scientists Release First Ever Image of Black Hole

Start the Quiz to find out

Start Quiz

Bryan Lynn wrote this story for VOA Learning English. Ashley Thompson was the editor.

We want to hear from you. Write to us in the Comments section, and visit our Facebook page.

Words in This Story

data n. information or facts about something

delighted adj. very pleased

virtual adj. something that can be done or seen using computers or the Internet instead of going to a place

shadow n. a dark area made by something blocking light

precise n. exact and correct

sensitive adj. ability to measure small and exact details

visual adj. relating to seeing

网友的学习评论(0条):
版权所有©2003-2019 南京通享科技有限公司,保留所有权利。未经书面许可,严禁转载本站内容,违者追究法律责任。 互联网经营ICP证:苏B2-20120186
网站备案:苏ICP备05000269号-1中国工业和信息化部网站备案查询
广播台