情系地球村 – 大衛隨想錄 David Caprice

情系地球村

Apr 22nd, 2009 • Category: 自由天地

情系地球村

— 黄达维(David C. Huang), 地球日, 2009.04.22

蓝天白云见天宇，
江河湖海乐游鱼，
绿林密布千万里，
奇花异草铺大地。

百鸟欢唱传春意，
大气清新人和亲，
城乡处处永安宁，
拥抱地球抒衷情。

世界地球日, 2009

1969年9月，美国民主党参议员盖洛德.尼尔森(Gaylord Nelson)在西雅图市的一次会议上提议，1970年春在全国举行群众性的环境保护运动。接着，1970年4月22日，美国哈佛大学学生丹尼斯.海斯(Denis Hayes) 等人协同组织了两千万美国人民参加的第一个“地球日”活动。1990年，这项活动从美国走向世界，并得到了联合国的肯定，4月22日因而被确定为“世界地球日”，至今已近40年。热爱和保护我们可爱的地球村，是每一个人类成员义不容辞的责任。值此“地球日”又一周年之际，心怀无限感慨，留笔于此。但愿地球家园环境，太空大地，万水千山，得以保护，代代传系，永远不负上苍神明给予我们如此美丽的人间乐园。

Tags: 环境保护, 美国, 美国华人, USA

One Response to “情系地球村”

Dessa Says:
April 24th, 2009 at 9:35 pm
Good post.

Comment 欢迎留言:

NASA 今日影像

Remnant of a Supernova

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

大衛隨想錄 David Caprice

繁体

One Response to “情系地球村”

Comment 欢迎留言:

Current Category Posts

Quote 引语随想

Melody of Life 生命的旋律

Categories

Recent Posts

Archives

Google Profile

YouTube Channel

NASA 今日影像

Facebook Fan Page