全球经济正从2008年初开始的严重经济衰退风险中恢复之际,20国集团(Group of 20 – G-20)成员国领导人于2009年9月24-25日聚集在美国宾夕法尼亚州的匹兹堡市(Pittsburgh)举行经济峰会。这是G-20今年第三次会议。美国总统奥巴马主持会议。会议目的是为了防止世界经济再次出现衰退。白宫说,二十国集团经济峰会的最重要任务是对金融市场加强管理,防止风险投资。
U.S. President Obama & Indonesian President Yudhoyono at G20 Toronto Summit 美国总统奥巴马和印尼总统尤多约诺在G20多伦多峰会期间会谈
– 黄达维 David C. Huang, June 2010 USA
Video Credit & Reference: The White House and 美国国务院国际信息局
U.S. President Obama & Indonesian President Yudhoyono at G20 Summit
President Obama met with Indonesian President Yudhoyono at G20 Summit in Toronto, Canada on June 27, 2010. President Obama said: “It is wonderful once again to see my good friend, the President of Indonesia, and members of his delegation. I obviously have enjoyed our interactions here, although my hope and wish was that I was going to be seeing him in Jakarta. Because of the crisis that we’ve had in the Gulf, I’ve had to delay the trip. But graciously, for a second time now, the President has re-extended the invitation, and I am confident that we are going to get there.”
President Obama and President Susilo Bambang Yudhoyono of Indonesia spoke to the media after meeting:
Vital clues about the devastating ends to the lives of massive stars can be found by studying the aftermath of their explosions. In its more than twelve years of science operations, NASA's Chandra X-ray Observatory has studied many of these supernova remnants sprinkled across the galaxy. The latest example of this important investigation is Chandra's new image of the supernova remnant known as G350.1-0.3. This stellar debris field is located some 14,700 light years from the Earth toward the center of the Milky Way. Evidence from Chandra and from ESA's XMM-Newton telescope suggest that a compact object within G350.1+0.3 may be the dense core of the star that exploded. The position of this likely neutron star, seen by the arrow pointing to "neutron star" in the inset image, is well away from the center of the X-ray emission. If the supernova explosion occurred near the center of the X-ray emission then the neutron star must have received a powerful kick in the supernova explosion. Data suggest this supernova remnant, as it appears in the image, is 600 and 1,200 years old. If the estimated location of the explosion is correct, this means the neutron star has been moving at a speed of at least 3 million miles per hour since the explosion. Another intriguing aspect of G350.1-0.3 is its unusual shape. Many supernova remnants are nearly circular, but G350.1-0.3 is strikingly asymmetrical as seen in the Chandra data in this image (gold). Infrared data from NASA's Spitzer Space Telescope (light blue) also trace the morphology found by Chandra. Astronomers think that this bizarre shape is due to stellar debris field expanding into a nearby cloud of cold molecular gas. The age of 600-1,200 years puts the explosion that created G350.1-0.3 in the same time frame as other famous supernovas that formed the Crab and SN 1006 supernova remnants. However, it is unlikely that anyone on Earth would have seen the explosion because of the obscuring gas and dust that lies along our line of sight to the remnant. These results appeared in the April 10, 2011 issue of The Astrophysical Journal. Image Credits: X-ray: NASA/CXC/SAO/I. Lovchinsky et al; IR: NASA/JPL-Caltech Read More