File:Cosmic distance ladder.jpg

本预览的尺寸：800 × 520像素。其他分辨率：320 × 208像素 | 640 × 416像素 | 1,024 × 666像素 | 1,280 × 832像素。

原始文件（1,280 × 832像素，文件大小：155 KB，MIME类型：image/jpeg）

本文件并非来自中文维基百科，而是来自维基共享资源。请参阅维基共享资源上的详细描述、讨论页、页面历史、日志。

维基共享资源是一个储存自由版权作品的项目。您可以向此项目作出贡献。

摘要

描述Cosmic distance ladder.jpg	English: For the calibration of relatively short distances the team observed Cepheid variables. These are pulsating stars which fade and brighten at rates that are proportional to their true brightness and this property allows astronomers to determine their distances. The researchers calibrated the distances to the Cepheids using a basic geometrical technique called parallax. With Hubble’s sharp-eyed Wide Field Camera 3 (WFC3), they extended the parallax measurements further than previously possible, across the Milky Way galaxy. To get accurate distances to nearby galaxies, the team then looked for galaxies containing both Cepheids and Type Ia supernovae. Type Ia supernovae always have the same intrinsic brightness and are also bright enough to be seen at relatively large distances. By comparing the observed brightness of both types of stars in those nearby galaxies, the team could then accurately measure the true brightness of the supernova. Using this calibrated rung on the distance ladder the accurate distance to additional 300 type Ia supernovae in far-flung galaxies was calculated. They compare those distance measurements with how the light from the supernovae is stretched to longer wavelengths by the expansion of space. Finally, they use these two values to calculate how fast the universe expands with time, called the Hubble constant.
日期	2016年6月2日, 17:30:00
来源	http://www.spacetelescope.org/images/heic1611a/
作者	NASA,ESA, A. Feild (STScI), and A. Riess (STScI/JHU)

许可协议

署名

ESA/Hubble images, videos and web texts are released by the ESA under the Creative Commons Attribution 4.0 International license and may on a non-exclusive basis be reproduced without fee provided they are clearly and visibly credited. Detailed conditions are below; see the ESA copyright statement for full information. For images created by NASA or on the hubblesite.org website, or for ESA/Hubble images on the esahubble.org site before 2009, use the {{PD-Hubble}} tag.

Conditions:

The full image or footage credit must be presented in a clear and readable manner to all users, with the wording unaltered (for example: "ESA/Hubble"). Web texts should be credited to ESA/Hubble (except when used by media). The credit should not be hidden or disassociated from the image footage. Links should be active if the credit is online. See the usage rights Q&A section on the ESA copyright page for guidance.
ESA/Hubble materials may not be used to state or imply the endorsement by ESA/Hubble or any ESA/Hubble employee of a commercial product or service.
ESA/Hubble requests a copy of the product sent to them to be indexed in their archive.
If an image shows an identifiable person, using that image for commercial purposes may infringe that person's right of privacy, and separate permission should be obtained from the individual.
If images or visuals are changed significantly from the original work (apart from resizing, cropping), we suggest that the changes are mentioned after the credit line. For example "Original image by ESA/Hubble (M. Kornmesser), warping and recolouring by NN".

Notes:

Note that this general permission does not extend to the use of ESA/Hubble's logo, which shall remain protected and may not be used or reproduced without prior and individual written consent of ESA/Hubble.
Also note that music, scientific papers and code on the esahubble.org site are not released under this license and can not be used for non-ESA/Hubble products.
By reproducing ESA/Hubble material, in part or in full, the user acknowledges the terms on which such use is permitted.

本文件采用知识共享署名 4.0 国际许可协议授权。

署名: ESA/Hubble

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	2016年6月3日 (五) 10:04		1,280 × 832（155 KB）	Jmencisom	User created page with UploadWizard

文件用途

以下页面使用本文件：

宇宙距离尺度

全域文件用途

以下其他wiki使用此文件：

cs.wikipedia.org上的用途
- Žebřík kosmických vzdáleností
en.wikipedia.org上的用途
es.wikipedia.org上的用途
- Escalera de distancias cósmicas
et.wikipedia.org上的用途
- Mustand:Kosmiliste kauguse redel
eu.wikipedia.org上的用途
- Lankide:Joxan Garaialde/Distantzia kosmikoen eskailera
- Distantzia kosmikoen eskailera
fa.wikipedia.org上的用途
- نردبان فاصله کیهانی
fi.wikipedia.org上的用途
- Kosmiset etäisyystikapuut
mk.wikipedia.org上的用途
- Скала на вселенски растојанија
ms.wikipedia.org上的用途
- Paralaks
- Paralaks dalam astronomi

元数据

此文件中包含有扩展的信息。这些信息可能是由数码相机或扫描仪在创建或数字化过程中所添加。

如果此文件的源文件已经被修改，一些信息在修改后的文件中将不能完全反映出来。

提供者	NASA, ESA, A. Feild (STScI), and A. Riess (STScI/JHU)
来源	ESA/Hubble
简短标题	Cosmic distance ladder
图像标题	For the calibration of relatively short distances the team observed Cepheid variables. These are pulsating stars which fade and brighten at rates that are proportional to their true brightness and this property allows astronomers to determine their distances. The researchers calibrated the distances to the Cepheids using a basic geometrical technique called parallax. With Hubble’s sharp-eyed Wide Field Camera 3 (WFC3), they extended the parallax measurements further than previously possible, across the Milky Way galaxy. To get accurate distances to nearby galaxies, the team then looked for galaxies containing both Cepheids and Type Ia supernovae. Type Ia supernovae always have the same intrinsic brightness and are also bright enough to be seen at relatively large distances. By comparing the observed brightness of both types of stars in those nearby galaxies, the team could then accurately measure the true brightness of the supernova. Using this calibrated rung on the distance ladder the accurate distance to additional 300 type Ia supernovae in far-flung galaxies was calculated. They compare those distance measurements with how the light from the supernovae is stretched to longer wavelengths by the expansion of space. Finally, they use these two values to calculate how fast the universe expands with time, called the Hubble constant.
使用条款	Creative Commons Attribution 4.0 International License
数据生成日期时间	2016年6月2日 (四) 17:30
联系信息	http://www.spacetelescope.org Karl-Schwarzschild-Strasse 2 Garching bei M√ºnchen, , D-85748 Germany
IIM版本	4

File:Cosmic distance ladder.jpg

摘要

许可协议

说明

此文件中描述的项目

描绘内容

版权状态 ^{简体中文（已转写）}

版权所有 ^{简体中文（已转写）}

许可协议

知识共享署名4.0国际 ^{简体中文（已转写）}

成立或创建时间

2 6 2016

媒体类型 ^{简体中文（已转写）}

image/jpeg

校验和 ^{简体中文（已转写）}

19dbffefe7e6c83902c6c7639dd4c6eada50b465

数据大小 ^{简体中文（已转写）}

158,582 字节

高度

832 像素

宽度

1,280 像素

文件历史

文件用途

全域文件用途

元数据

摘要

许可协议

说明

此文件中描述的项目

描绘内容

版权状态 简体中文（已转写）

版权所有 简体中文（已转写）

许可协议

知识共享署名4.0国际 简体中文（已转写）

成立或创建时间

2 6 2016

媒体类型 简体中文（已转写）

image/jpeg

校验和 简体中文（已转写）

19dbffefe7e6c83902c6c7639dd4c6eada50b465

数据大小 简体中文（已转写）

158,582 字节

高度

832 像素

宽度

1,280 像素

文件历史

文件用途

全域文件用途

元数据

版权状态 ^{简体中文（已转写）}

版权所有 ^{简体中文（已转写）}

知识共享署名4.0国际 ^{简体中文（已转写）}

媒体类型 ^{简体中文（已转写）}

校验和 ^{简体中文（已转写）}

数据大小 ^{简体中文（已转写）}