File:Hubble Finds Giant Halo Around the Andromeda Galaxy (18405594461).jpg

From Wikimedia Commons, the free media repository
Jump to navigation Jump to search

Original file ‎(1,280 × 1,040 pixels, file size: 342 KB, MIME type: image/jpeg)

Captions

Captions

Add a one-line explanation of what this file represents

Summary

[edit]
Description

This diagram shows how scientists determined the size of the halo of the Andromeda galaxy. Because the gas in the halo is dark, the team measured it by using the light from quasars, the very distant bright cores of active galaxies powered by black holes. They observed the quasars’ light as it traveled through the intervening gas. The halo’s gas absorbed some of that light and made the quasar appear darker in a very small wavelength range. By measuring the tiny dip in brightness at that specific range, scientists could tell how much gas is between us and each quasar. Some quasars showed no dip in brightness, and this helped define the size of the halo.

More information: <a href="http://www.spacetelescope.org/images/opo1515a/" rel="nofollow">www.spacetelescope.org/images/opo1515a/</a>

Credit:

NASA, ESA, and A. Feild (STScI)
Date
Source Hubble Finds Giant Halo Around the Andromeda Galaxy
Author Hubble ESA

Licensing

[edit]
w:en:Creative Commons
attribution
This file is licensed under the Creative Commons Attribution 2.0 Generic license.
You are free:
  • to share – to copy, distribute and transmit the work
  • to remix – to adapt the work
Under the following conditions:
  • attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
This image was originally posted to Flickr by Hubble Space Telescope / ESA at https://flickr.com/photos/51268976@N08/18405594461. It was reviewed on 8 December 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

8 December 2020

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current18:38, 8 December 2020Thumbnail for version as of 18:38, 8 December 20201,280 × 1,040 (342 KB)Eyes Roger (talk | contribs)Transferred from Flickr via #flickr2commons

You cannot overwrite this file.

There are no pages that use this file.

Metadata

This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.

Retrieved from "https://commons.wikimedia.org/w/index.php?title=File:Hubble_Finds_Giant_Halo_Around_the_Andromeda_Galaxy_(18405594461).jpg&oldid=726194069"