加载中…行星千万亿
(2013-01-09 11:00:48)
标签：
杂谈 |
分类： 科学与技术 |
http://photos.state.gov/libraries/amgov/3234/week_1/01042013_kepler20130103-640_jpg_600.jpg
加州理工学院的天文学家说，在我们的银河系中有至少1,000亿颗行星。
举目望夜空，繁星点点。那里满布着大量行星——至少有千万亿颗。
这是位于帕萨迪纳市（Pasadena）的加州理工学院（California Institute of Technology，简称Caltech）的天文学家通过一项新的研究所得出的结论。它以更多证据证明，行星系统乃是宇宙中的常态（cosmic norm）。研究小组成员是在分析围绕一颗被称为“开普勒-32”（Kepler-32）的恒星运行的行星时作出的这一估算——他们说，这些行星对我们银河系的绝大部分行星中有代表性，因而可作为一个理想的典型研究对象，用以了解大多数这样的世界是如何形成的。
近期被《天体物理学报》（Astrophysical Journal）接受刊登的该项研究的共同作者、加州理工学院行星天文学助理教授约翰·约翰逊（John Johnson）说：“在银河系中——仅仅在我们的银河系中，就有至少1,000亿颗行星。”“这令人难以想象。”
上图是艺术图绘：我们太阳系以外的各式各样的行星。
有关这项研究的更多信息，请见NASA（美国国家航空航天局）新闻稿。
Read more: http://iipdigital.usembassy.gov/st/chinese/inbrief/2013/01/20130107140682.html#ixzz2HRZELBTr
Billions and Billions of Planets
http://photos.state.gov/libraries/amgov/3234/week_1/01042013_kepler20130103-640_jpg_600.jpg
There are at least 100 billion planets in our galaxy, according to astronomers at the California Institute of Technology.
Look up at the night sky and you’ll see stars, sure. But the sky is also filled with planets — billions and billions of them at least.
That’s the conclusion of a new study by astronomers at the California Institute of Technology (Caltech) in Pasadena, which provides yet more evidence that planetary systems are the cosmic norm. Team members made their estimate while analyzing planets orbiting a star called Kepler-32 — planets that are representative, they say, of the vast majority of planets in our galaxy and thus serve as a perfect case study for understanding how most of these worlds form.
“There are at least 100 billion planets in the galaxy, just our galaxy,” says John Johnson, assistant professor of planetary astronomy at Caltech and coauthor of the study, which was recently accepted for publication in the Astrophysical Journal. “That’s mind-boggling.”
Above is an artist’s conception of an assortment of planets from beyond our solar system.
For more on the study, see the NASA press release.
Read more: http://iipdigital.usembassy.gov/st/english/inbrief/2013/01/20130104140641.html#ixzz2HRZFY18B
喜欢
0
赠金笔