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=== Spiral galaxies === === Elliptical galaxies === ...

...ay [[universe]], including the existence of large-scale structures such as galaxies. The theory was proposed by [[Alan Guth]] in the 1970s. ...oblem solved by inflation is the origin of large-scale structures, such as galaxies. Inflation theory says that in a slow expansion of the universe, [[quantum ...

...ased on their visual appearance. There are several schemes in use by which galaxies can be classified according to their morphologies, the most famous being th The Hubble sequence is a morphological classification scheme for [[galaxies]] invented by [[Edwin Hubble]] in 1926.<ref name="hubble26a">{{cite journal ...

|[[Image:Messier51.jpg|thumb|200px|The arms of [[Spiral galaxy|spiral galaxies]] often have the shape of a logarithmic spiral, here the [[Whirlpool Galaxy ...pitch angle for a galaxy such as the Milky Way. In general, arms in spiral galaxies have pitch angles ranging from about 10 to 40 degrees. ...

...ombination (cosmology)|recombination]] occurred but before [[star]]s and [[galaxies]] was created is called the "dark ages". During this time, most of the [[ma ...e Reionization era which is the hallmark event of this early generation of galaxies. ...

...llion years before the Big Rip. About 60 million years before the Big Rip, galaxies would begin to break up as small parts as gravity becomes too weak to hold ...

...fundamental plane with a higher than average number of [[Local Group|local galaxies]] in the sky as seen from Earth. ...

...e, measurement of eclipsing binaries offers a way to gauge the distance to galaxies. Accuracy at the 5% level up to a distance of around 3 million parsecs.<ref ...sions to be used as standard candles to measure the distance to their host galaxies, because the visual magnitude of the supernovae depends primarily on the di ...

'''Spiral galaxies.''' There are several spiral arms in the [[Milky Way]], each with a logarit ...

...e universe, hidden far beyond our vision. They could have formed their own galaxies and solar systems too. ...

....|title=Magnetic draping of merging cores and radio bubbles in clusters of galaxies|journal=Monthly Notices of the Royal Astronomical Society|date=2006|volume= ...has been detected around planets, moons, solar coronal mass ejections, and galaxies.<ref>{{cite journal|last1=Pfrommer|first1=Christoph|last2=Dursi|first2=L. J ...

...791435533}}</ref> It is worth noting that our [[local group|local group of galaxies]] are bound by [[gravitation]], and its changes and aging can be discussed | The [[Metric expansion of space|Universe's expansion]] causes all galaxies beyond the former Milky Way's [[Local Group]] to disappear beyond the [[Par ...