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=== '''Cepheid Klasik''' ===
Cepheid klasik (dikenal juga dengan
Cepheid Klasik digunakan untuk menentukan jarak antar [[galaksi]] di dalam Grup Lokal dan di luarnya, dan merupakan cara untuk menentukan [[konstanta Hubble]]. <ref>{{Cite journal|last=Freedman|first=Wendy L.|last2=Madore|first2=Barry F.|last3=Gibson|first3=Brad K.|last4=Ferrarese|first4=Laura|last5=Kelson|first5=Daniel D.|last6=Sakai|first6=Shoko|last7=Mould|first7=Jeremy R.|last8=Kennicutt|first8=Robert C., Jr.|last9=Ford|first9=Holland C.|date=2001-05-01|title=Final Results from the Hubble Space Telescope Key Project to Measure the Hubble Constant|url=https://ui.adsabs.harvard.edu/abs/2001ApJ...553...47F|journal=The Astrophysical Journal|volume=553|pages=47–72|doi=10.1086/320638|issn=0004-637X}}</ref><ref>{{Cite journal|last=Tammann|first=G. A.|last2=Sandage|first2=A.|last3=Reindl|first3=B.|date=2008-07-01|title=The expansion field: the value of H 0|url=https://ui.adsabs.harvard.edu/abs/2008A&ARv..15..289T|journal=Astronomy and Astrophysics Review|volume=15|pages=289–331|doi=10.1007/s00159-008-0012-y|issn=0935-4956}}</ref><ref>{{Cite journal|last=Freedman|first=Wendy L.|last2=Madore|first2=Barry F.|date=2010-09-01|title=The Hubble Constant|url=https://ui.adsabs.harvard.edu/abs/2010ARA&A..48..673F|journal=Annual Review of Astronomy and Astrophysics|volume=48|pages=673–710|doi=10.1146/annurev-astro-082708-101829|issn=0066-4146}}</ref><ref>{{Cite journal|last=Ngeow|first=C.|last2=Kanbur|first2=S. M.|date=2006-05-01|title=The Hubble Constant from Type Ia Supernovae Calibrated with the Linear and Nonlinear Cepheid Period-Luminosity Relations|url=https://ui.adsabs.harvard.edu/abs/2006ApJ...642L..29N|journal=The Astrophysical Journal|volume=642|pages=L29–L32|doi=10.1086/504478|issn=0004-637X}}</ref><ref>{{Cite journal|last=Macri|first=Lucas M.|last2=Riess|first2=Adam G.|date=2009-09-01|title=The SH0ES Project: Observations of Cepheids in NGC 4258 and Type Ia SN Hosts|url=https://ui.adsabs.harvard.edu/abs/2009AIPC.1170...23M|volume=1170|pages=23–25|doi=10.1063/1.3246452}}</ref>Cepheid Klasik juga digunakan untuk mengklasifikasi berbagai karakteristik [[galaksi Bimasakti]], seperti ketinggian [[Matahari]] di atas bidang galaksi dan struktur [[galaksi spiral]].<ref name=":0">{{Cite journal|last=Majaess|first=D. J.|last2=Turner|first2=D. G.|last3=Lane|first3=D. J.|date=2009-09-01|title=Characteristics of the Galaxy according to Cepheids|url=https://ui.adsabs.harvard.edu/abs/2009MNRAS.398..263M|journal=Monthly Notices of the Royal Astronomical Society|volume=398|pages=263–270|doi=10.1111/j.1365-2966.2009.15096.x|issn=0035-8711}}</ref>
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