File:Standing out from the Crowd.jpg
原始文件 (1,280 × 1,321像素,文件大小:713 KB,MIME类型:image/jpeg)
说明
摘要[编辑]
描述Standing out from the Crowd.jpg |
English: The compact nature of globular clusters is a double-edged sword. On the one hand, having so many stars of a similar age in one bundle gives astronomers insights into the chemical makeup of our galaxy in its early history. But, at the same time, the high density of stars in the cores of globulars also makes it difficult for astronomers to resolve individual stars.
The core of NGC 6642, shown here in this Hubble Space Telescope image, is particularly dense, making this globular a difficult observational target for most telescopes. Furthermore, it occupies a very central position in our galaxy, which means that images inadvertently capture many stars that don’t belong to the cluster — these “field stars” just get in the way. However, using Hubble’s powerful Advanced Camera for Surveys (ACS), astronomers can identify and remove such distracting field stars, and resolve the cluster’s dense core in unprecedented detail. Using Hubble’s ACS, astronomers have already made many interesting finds about NGC 6642. For example, many “blue stragglers” (stars which seemingly lag behind in their rate of aging) have been spotted in this globular, and it is known to be lacking in low-mass stars. This picture was created from visible and infrared images taken with the Wide Field Channel of the Advanced Camera for Surveys. The field of view is approximately 1.6 by 1.6 arcminutes. |
日期 | |
来源 | http://www.spacetelescope.org/images/potw1150a/ |
作者 | ESA/Hubble & NASA |
许可协议[编辑]
- 您可以自由地:
- 共享 – 复制、发行并传播本作品
- 修改 – 改编作品
- 惟须遵守下列条件:
- 署名 – 您必须对作品进行署名,提供授权条款的链接,并说明是否对原始内容进行了更改。您可以用任何合理的方式来署名,但不得以任何方式表明许可人认可您或您的使用。
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 | 2012年2月6日 (一) 11:53 | 1,280 × 1,321(713 KB) | Jmencisom(留言 | 贡献) |
您不可以覆盖此文件。
文件用途
没有页面使用本文件。
全域文件用途
以下其他wiki使用此文件:
- el.wikipedia.org上的用途
- en.wikipedia.org上的用途
- es.wikipedia.org上的用途
- fa.wikipedia.org上的用途
- it.wikipedia.org上的用途
- mk.wikipedia.org上的用途
- my.wikipedia.org上的用途
- pl.wikipedia.org上的用途
- tr.wikipedia.org上的用途
- zh.wikipedia.org上的用途
元数据
此文件含有额外信息,这些信息可能是创建或数字化该文件时使用的数码相机或扫描仪所添加的。如果文件已从其原始状态修改,某些详细信息可能无法完全反映修改后的文件。
著作权状况 | 著作权状况未设置 |
---|---|
原始文件唯一ID | uuid:6A951B3C9DC9E011BCD4D7CC4E7841FE |
使用软件 | Adobe Photoshop CS3 Windows |