Kabanyakannya dua pertalu matan galaksi spiral nang diobservasi baisi kumpunen tambahan nang struktur bantuknya nang kaya batang,<ref name="mihalas1968">{{Cite book| author=D. Mihalas | date=1968 | title=Galactic Astronomy | publisher=W. H. Freeman | isbn=978-0-7167-0326-6}}</ref> bapanjang mulai matan binculan ditangahnya, di hujungnya tangan galaksi spiral dimulai. Proporsi [[Galaksi spiral bapalang|spiral bapalang]] nang tagantung lawan [[Galaksi spiral nang kada bapalang|spiral kada bapalang]] pinanya sudah barubah sapanjang sajarah matan [[alam samasta]], 10% haja spiral nang baisi palang 8 miliar tahun bahari, sampai sakitar saparapatnya 2,5 miliar tahun bahari. Sampai wayah ini, kira-kira dua pertalu [[galaksi|galaksi-galaksi]] nangbkawa diitihi di alam samasta ([[Volume Hubble]]) baisi palang.<ref>{{cite web |url= https://www.sciencedaily.com/releases/2014/01/140116085103.htm |title= Hubble and Galaxy Zoo Find Bars and Baby Galaxies Don't Mix |date= 16 January 2014 |website= [[Science Daily]] }}</ref>
[[MilkyGalaksi WayBima Sakti]] ismarupakan aspiral barred spiralbapalang, althoughbiar thepalangnya barsurang itselfnagalih isbanar difficultdiitihi tomulai observeBumi frommaraga Earth'sandak currentplanetnya positionnang within theaparak galacticcakram discgalaksi.<ref>{{cite magazine|url=http://www.sciamdigital.com/index.cfm?fa=Products.ViewIssuePreview&ARTICLEID_CHAR=3BC08F0C-2B35-221B-67A9F2AE04AFC79A|url-status=dead|archive-url=https://web.archive.org/web/20130906193501/http://www.sciamdigital.com/index.cfm?fa=Products.ViewIssuePreview&ARTICLEID_CHAR=3BC08F0C-2B35-221B-67A9F2AE04AFC79A|title=Ripples in a Galactic Pond|magazine=Scientific American|date=October 2005|archive-date=6 September 2013}}</ref> TheBukti mostpaling convincingmanjanjiakan evidencematan forbintang thenang starsmambantuk formingpalang adi bartangah ingalaksi thebaasal galacticmatan centersapalihan comessurvei fromnang severalhanyar recent surveysdigawi, includingtamasuk thenang baasal matan [[SpitzerTeleskop luar Spaceangkasa TelescopeSpitzer]].<ref>{{cite journal|date=September 2005|title=First GLIMPSE Results on the Stellar Structure of the Galaxy|journal=The Astrophysical Journal Letters|volume=630|issue=2|pages=L149–L152|arxiv=astro-ph/0508325|bibcode=2005ApJ...630L.149B|doi=10.1086/491785|author1=R. A. Benjamin|author2=E. Churchwell|author3=B. L. Babler|author4=R. Indebetouw|author5=M. R. Meade|author6=B. A. Whitney|author7=C. Watson|author8=M. G. Wolfire|author9=M. J. Wolff|author10=R. Ignace|author11=T. M. Bania|author12=S. Bracker|author13=D. P. Clemens|author14=L. Chomiuk|author15=M. Cohen|author16=J. M. Dickey|author17=J. M. Jackson|author18=H. A. Kobulnicky|author19=E. P. Mercer|author20=J. S. Mathis|author21=S. R. Stolovy|author22=B. Uzpen}}</ref>
TogetherBasamaan withlawan [[IrregularGalaksi galaxykada baaturan|irregulargalaksi galaxieskada baaturan]], spiralgalaksi galaxies make up approximatelymambantuk 60% ofgalaksi galaxiesnang inada di today'salam universesamasta.<ref>{{cite journal|date=February 1996|title=The APM Bright Galaxy Catalogue|journal=[[Monthly Notices of the Royal Astronomical Society]]|volume=278|issue=4|pages=1025–1048|arxiv=astro-ph/9603040|bibcode=1996MNRAS.278.1025L|doi=10.1093/mnras/278.4.1025|author=Loveday, J.}}</ref> TheyBuhannya arebiasanya mostlykawa foundditamui indi low-densitydairah regionsnang andkapadatannya arerandah rarewan injarang theditamui centersditangah of-tangah galaxykumpulan clustersgalaksi.<ref>{{cite journal|date=March 1980|title=Galaxy morphology in rich clusters — Implications for the formation and evolution of galaxies|journal=The Astrophysical Journal|volume=236|pages=351–365|bibcode=1980ApJ...236..351D|doi=10.1086/157753|author=Dressler, A.}}</ref>
