单词：Eshta'ol
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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
超大质量黑洞
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
超大质量黑洞
When the results came down from the telescope he saw something that was completely unexpected. The picture from the active galaxy where he hoped to find a black hole was unreadable. NGC 1068 was just
超大质量黑洞
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.
超大质量黑洞
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
超大质量黑洞
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
超大质量黑洞
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
超大质量黑洞
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
超大质量黑洞
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
超大质量黑洞
Kenyas Ol Pejeta Conservancy Driving Animals Away from Humans 肯尼亚Ol Pejeta保护区保护动物远离人类 LAIKIPIA, KENYA In Laikipia, Kenyan rangers are driving game farther into a 36,000 hectare conservancy to protect the animals from confl
VOA标准英语2015年(二月)
Tim called Howard. Tim needed help. He needed help with his golf swing. He had a bad golf swing. He was a bad golfer. Howard had a good golf swing. He was a good golfer. Will you help me improve my golf swing? Tim asked. Yes, Ill help you improve you
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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
超大质量黑洞
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
超大质量黑洞
By Jim Malone Washington 06 February 2007 The war in Iraq looms as the major issue in the 2008 U.S. presidential race. The war is already causing splits among White House candidates in both major political parties. VOA national correspondent Jim Mal
2007年VOA标准英语（二月）
By Lisa Bryant Paris 23 May 2006 Pascal Lamy, gestures as he delivers a speech in Paris, Friday, May 20, 2005 World Trade Organization head Pascal Lamy said he doubts trade minister who are meeting in
2006年VOA标准英语（五月）
By Gary Thomas Washington 22 May 2007 The growing political crisis in Pakistan has driven two onetime rivals into an alliance. Former prime ministers Benazir Bhutto and Nawaz Sharif, who are both in exile, have teamed up to raise the pressure on Pres
2007年VOA标准英语（五月）
BBC Learning English Weekender Poles in the media Callum:Hello, I'm Callum Robertson and this is Weekender. One of the largest groups of new migrants to Britain are Poles. In 2004 Poland entered the European Union which gave Polish people much great
Weekender
By Sabina Castelfranco Rome 06 November 2006 Supporters of Northern league party stage a protest in front of 'Nagib Mahfouz' school, in Milan, October 10, 2006 An Arabic school in Milan, which has sparked debate about religious versus seculareducati
2006年VOA标准英语（十一月)
By Benjamin Sand Islamabad 16 June 2007 A senior U.S. official in Pakistan provided the strongest indication yet that Washington will stand by embattled Pakistan leader Pervez Musharraf. U.S. Deputy Secretary of State John Negroponte, in Pakistan for
2007年VOA标准英语（六月）
Ex-hostage Ingrid Betancourt received a joyful welcome in France, where she arrived Friday after spending more than six years as a hostage of Colombian rebels. Lisa Bryant has more on a homecoming of sorts for Betancourt, who has dual French-Colombi
VOA标准英语2008年（七月）