File:Gaia’s first sky map ESA365175.png

原始檔案 (3,840 × 2,400 像素,檔案大小:5.52 MB,MIME 類型:image/png


摘要

描述
English: An all-sky view of stars in our Galaxy – the Milky Way – and neighbouring galaxies, based on the first year of observations from ESA’s Gaia satellite, from July 2014 to September 2015.

This map shows the density of stars observed by Gaia in each portion of the sky. Brighter regions indicate denser concentrations of stars, while darker regions correspond to patches of the sky where fewer stars are observed. The Milky Way is a spiral galaxy, with most of its stars residing in a disc about 100 000 light-years across and about 1000 light-years thick. This structure is visible in the sky as the Galactic Plane – the brightest portion of this image –which runs horizontally and is especially bright at the centre. Darker regions across the Galactic Plane correspond to dense clouds of interstellar gas and dust that absorb starlight along the line of sight. Many globular and open clusters – groupings of stars held together by their mutual gravity – are also sprinkled across the image. Globular clusters, large assemblies of hundreds of thousands to millions of old stars, are mainly found in the halo of the Milky Way, a roughly spherical structure with a radius of about 100 000 light-years, and so are visible across the image. Open clusters are smaller assemblies of hundreds to thousands of stars and are found mainly in the Galactic Plane. The two bright objects in the lower right of the image are the Large and Small Magellanic Clouds, two dwarf galaxies orbiting the Milky Way. Other nearby galaxies are also visible, most notably Andromeda (also known as M31), the largest galactic neighbour to the Milky Way, in the lower left of the image. Below Andromeda is its satellite, the Triangulum galaxy (M33). A number of artefacts are also visible on the image. These curved features and darker stripes are not of astronomical origin but rather reflect Gaia’s scanning procedure. As this map is based on observations performed during the mission’s first year, the survey is not yet uniform across the sky. These artefacts will gradually disappear as more data are gathered during the five-year mission. High resolution versions of the Gaia map, with transparent background, are available to download from:http://sci.esa.int/gaia/58209

Acknowledgement: A. Moitinho & M. Barros (CENTRA – University of Lisbon), on behalf of DPAC
日期
來源 http://www.esa.int/spaceinimages/Images/2016/09/Gaia_s_first_sky_map
作者 European Space Agency
授權許可
(重用此檔案)
ESA/Gaia/DPAC,CC BY-SA 3.0 IGO
Title
InfoField
Gaia’s first sky map
Mission
InfoField
Gaia
Activity
InfoField
Space Science

授權條款

w:zh:創用CC
姓名標示 相同方式分享
姓名標示: ESA/Gaia/DPAC
您可以自由:
  • 分享 – 複製、發佈和傳播本作品
  • 重新修改 – 創作演繹作品
惟需遵照下列條件:
  • 姓名標示 – 您必須指名出正確的製作者,和提供授權條款的連結,以及表示是否有對內容上做出變更。您可以用任何合理的方式來行動,但不得以任何方式表明授權條款是對您許可或是由您所使用。
  • 相同方式分享 – 如果您利用本素材進行再混合、轉換或創作,您必須基於如同原先的相同或兼容的條款,來分布您的貢獻成品。

說明

添加單行說明來描述出檔案所代表的內容

在此檔案描寫的項目

描繪內容

檔案歷史

點選日期/時間以檢視該時間的檔案版本。

日期/時間縮⁠圖尺寸使用者備⁠註
目前2017年9月24日 (日) 09:33於 2017年9月24日 (日) 09:33 版本的縮圖3,840 × 2,400(5.52 MB)European Space Agency, Id 365175, http://www.esa.int/spaceinimages/Images/2016/09/Gaia_s_first_sky_map, User:Fæ/Project_list/ESA

下列頁面有用到此檔案:

全域檔案使用狀況

以下其他 wiki 使用了這個檔案: