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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
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
Columbus Day is a special holiday all across the Americas. Countries in North, Central and South America celebrate the anniversary of Christopher Columbus's arrival in the Americas on October the 12th, 1492. In the United States, the day is called Co
英语课程学习计划和讲义
by Michael W. Flynn First, a disclaimer: Although I am an attorney, the legal information in this podcast is not intended to be a substitute for seeking personalized legal advice from an attorney licensed to practice in your jurisdiction. Further, I
法律英语 Legal Lad
She was a fast eater. She liked to eat fast. She ate like a wolf. I am like a wolf, she said. He was a slow eater. He liked to eat slow. He ate like a turtle. You are like a turtle, she said. She didnt talk at the dinner table. All she did was eat. H
超级简单英语阅读
THIS IS AMERICA -March 4, 2002: The Lost Colony By Jill Moss . . . . . . . Broadcast: March 4, 2002 VOICE ONE: In Fifteen-Eighty -Seven, more than one-hundred men, women and children sailed from Brita
This is America
DEVELOPMENT REPORT -February 11, 2002: Tools For Life By Jill Moss This is the VOA Special English Development Report. Experts say deaths from infectious diseases can be greatly reduced at very little
农业与发展
ClipMatthew Nicholls I would consider myself British first and then Welsh but not English, Im sorry but definitely not English. Sue:In Private lives today we meet Matthew Nicholls. Matthew has lived all his life in Cardiff, the capital city of Wales
英语讨论
A: Where are you going? B: I have to go to work. A: Going to work where? B: Im working at the polling place. A: I didnt know you were working there this year. B: I work at the polling place every year. A: How did you get that job? B: I signed up for
英语情景对话-选举
A: Do you have a swimming pool in this hotel? B: We don't have a pool, sir, but we do have swim stations in the gym. A: I never heard of a swim station. Is that like a train or bus station? B: It's just a deep bathtub with a current of water that you
英语情景对话-旅馆
A: I think I've looked everywhere, but I haven't seen a swimming pool here. B: This hotel has no full-size pool, but we do have swim stations in our gym. A: Swim stations? Whoever heard of such a thing? B: You swim in a swim station just like you run
英语情景对话-旅馆
A: Are you planning on voting? B: Yes. Are you? A: I will be voting tomorrow. B: Whats your polling place? A: My polling place is at the park up the street. B: Oh, yeah? A: Yeah, where is yours? B: I dont know. A: How is it you dont know? B: The loca
英语情景对话-选举
A: Are you voting tomorrow? B: Of course. What about you? A: You know that I am. B: Where is your polling place? A: Its at the park up the street. B: Oh, is that right? A: Wheres your polling place? B: I have no idea. A: How come you dont know where
英语情景对话-选举
A: Are you going to vote tomorrow? B: I sure am. How about you? A: I am. B: Do you know where your polling place is? A: My polling place is up the street at the park. B: Oh, really? A: Wheres yours at? B: Im not sure. A: You should know that already.
英语情景对话-选举
A: Are you leaving? B: Im going to work. A: You have a job? B: Im going to work at the polling place. A: Youre working there this year? B: I work there every year. A: How are you able to work at the polling place? B: I applied for the job online. A:
英语情景对话-选举
BBC Learning English Weekender Polar Explorer Amber: Hello, I'm Amber, and youre listening to bbclearningenglish.com. In Weekender today, we listen to an interview with explorer, Rosie Stancer. In March, Rosie sets off on her latest expedition walki
Weekender
45 国际小儿麻痹预防运动 DATE=5-7-01 TITLE=DEVELOPMENT REPORT - UN Polio Campaign BYLINE=Jill Moss (Start at 1'01
科技之光
LONDON, Jan. 7 (Xinhua) -- English soccer club Manchester（曼彻斯特 ） City confirmed on Friday that they have signed striker Edin Dzeko from Wolfsburg for 27 million pounds (42 million U.S. dollars). The 24-year-old Bosnian has agreed to a fou
英语新闻
PARIS, May 7 (Xinhua) -- French president-elect Francois Hollande on Monday vowed to further the Sino-French exchange and cooperation in a meeting with Kong Quan, the Chinese Ambassador to France. Hollande said France recognizes China's important inf
英语新闻