跳转到内容

File:Starburst in NGC 4449 (captured by the Hubble Space Telescope).jpg

页面内容不支持其他语言。
這個文件來自維基共享資源
维基百科,自由的百科全书

原始文件 (8,736 × 5,630像素,文件大小:74.28 MB,MIME类型:image/jpeg


描述

Hundreds of thousands of vibrant blue and red stars blaze in this image taken by NASA's Hubble Space Telescope. Hot bluish-white clusters of massive stars are scattered throughout the galaxy, interspersed with numerous dustier, reddish regions of current star formation. Massive dark clouds of gas and dust are silhouetted against the starlight.

NGC 4449 has been forming stars for several billion years, but currently it is experiencing a star formation event at a much higher rate than in the past. This unusually explosive and intense star formation activity qualifies as a starburst. At the current rate, the gas supply that feeds the stellar production would only last for another billion years or so.

Starbursts usually occur in the central regions of galaxies, but NGC 4449 has more widespread star formation activity, since the very youngest stars are observed both in the nucleus and in streams surrounding the galaxy.

A global starburst like NGC 4449 resembles primordial star forming galaxies, which grew by merging with and accreting smaller stellar systems. Since NGC 4449 is close enough to be observed in great detail, it is the ideal laboratory for the investigation of what may have occurred during galactic formation and evolution in the early universe.

It's likely that the current widespread starburst was triggered by interaction or merging with a smaller companion. NGC 4449 belongs to a group of galaxies in the constellation Canes Venatici. Astronomers think that NGC 4449's star formation has been influenced by interactions with several of its neighbors.

Tiếng Việt: Hình ảnh thiên hà vô định hình NGC 4449 quan sát bởi kính viễn vọng không gian Hubble. Ảnh: ASA, ESA, A. Aloisi (STScI/ESA) và The Hubble Heritage (STScI/AURA)-ESA/Hubble Collaboration
日期
来源 http://hubblesite.org/newscenter/archive/releases/2007/26/image/a/ (direct link)
作者 NASA, ESA, A. Aloisi (STScI/ESA), and The Hubble Heritage (STScI/AURA)-ESA/Hubble Collaboration
授权
(二次使用本文件)
Public domain
This file is in the public domain because it was created by NASA and ESA. NASA Hubble material (and ESA Hubble material prior to 2009) is copyright-free and may be freely used as in the public domain without fee, on the condition that only NASA, STScI, and/or ESA is credited as the source of the material. This license does not apply if ESA material created after 2008 or source material from other organizations is in use.

The material was created for NASA by Space Telescope Science Institute under Contract NAS5-26555, or for ESA by the Hubble European Space Agency Information Centre. Copyright statement at hubblesite.org or 2008 copyright statement at spacetelescope.org.

For material created by the European Space Agency on the spacetelescope.org site since 2009, use the {{ESA-Hubble}} tag.

Featured 图像

维基共享资源维基百科

本文件是维基共享资源特色图片(Featured pictures),并被视为最好的图像之一。
 本图像长宽比8:516:1016:9,适于用作宽屏幕桌面背景(请见图库)。

维基百科
 本文件是英语维基百科特色图片(Featured pictures),并被视为最好的图像之一。
 本文件是波斯语维基百科特色图片(نگاره‌های برگزیده),并被视为最好的图像之一。
 本文件是马来语维基百科特色图片(Gambar pilihan),并被视为最好的图像之一。

如果你拥有相似质量的可采用适当著作权许可协议发布的图像,一定要上传标记推荐它。

This image was selected as picture of the day on Vietnamese Wikipedia.

说明

添加一行文字以描述该文件所表现的内容

此文件中描述的项目

描繪內容

image/jpeg

77,885,833 字节

5,630 像素

8,736 像素

a1ebb1903950430409d6d5e971ee0f4149243604

文件历史

点击某个日期/时间查看对应时刻的文件。

日期/时间缩⁠略⁠图大小用户备注
当前2009年10月31日 (六) 13:452009年10月31日 (六) 13:45版本的缩略图8,736 × 5,630(74.28 MB)TryphonOriginal size, from http://imgsrc.hubblesite.org/hu/db/images/hs-2007-26-a-full_jpg.jpg.
2007年7月4日 (三) 11:432007年7月4日 (三) 11:43版本的缩略图1,280 × 825(1.47 MB)Winiar{{Information |Description=NGC 4449 galaxy photo taken by Hubble Space Telescope |Source=http://hubblesite.org/newscenter/archive/releases/2007/26/image/a/format/xlarge_web/ |Date=Exposure Date(s): November 2005<br>Release Date: July 3, 2007 |Author=Image

以下2个页面使用本文件:

全域文件用途

元数据