It is the spiral galaxy NGC 4603, the most distant galaxy in which Cepheidvariables have been found.
本图是其中一个星系:漩涡星系ngc 4603,本报告中发现造父变星的最远星系。
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NASA Hubble Space Telescope (HST) view of the magnificent spiral galaxy NGC 4603, the most distant galaxy in which a special class of pulsating stars called Cepheidvariables have been found.
This was accomplished by observing Cepheidvariables at optical wavelengths out to greater distances than obtained previously and comparing those to similar measurements from ground-based telescopes.