Image: SDSS Mrk 421
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SDSS_Mrk_421.jpg (512 × 512 pixels, file size: 18 KB, MIME type: image/jpeg)
Description: Sloan Digital Sky Survey image of blazar Markarian 421.
Title: SDSS Mrk 421
Credit: http://skyserver.sdss.org/
Author: Sloan Digital Sky Survey
Usage Terms: Creative Commons Attribution 4.0
License: CC BY 4.0
License Link: https://creativecommons.org/licenses/by/4.0
Attribution Required?: Yes
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