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Among the galaxies, there are apparently three main categories, according to their appearance: the disk galaxies ( ... Physically, it is not necessary so clear (at least in the opinion of the present author) if this classification is real, because there exist intermediate types even between ellipticals and spirals, i.e.
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www.seds.org/messier/spir.html
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Many different types of galaxies exist. The different types of galaxies not only appear different, but have different evolutionary histories as well. The three fundamental classes of galaxies are elliptical, spiral, and irregular.
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cas.sdss.org/dr7/en/astro/galaxies/galaxies.asp
cas.sdss.org/dr7/en/astro/galaxies/galaxies.asp
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There are three main types of galaxies: Elliptical, Spiral, and Irregular. Two of these three types are further divided and classified into a system that is now known the tuning fork diagram. When Hubble first created this diagram, he believed that this was an evolutionary sequence as well as a classification.
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www.astro.cornell.edu/academics/courses/astro2201/galax...
www.astro.cornell.edu/academics/courses/astro2201/galaxies/types.htm
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What types of galaxies do we find in the universe? ... At the moment, we consider common types of galaxies and we ask about characteristics of galaxies that you can see with visible light. ... Notice the gas connecting the three galaxies.
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zebu.uoregon.edu/~soper/Galaxies/types.html
zebu.uoregon.edu/~soper/Galaxies/types.html
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The three types are denoted with the lowercase letters "a," "b," and "c." There also exist galaxies that are intermediate between ellipticals and spirals. Such systems have the disk shape characteristic of the latter but no spiral arms.
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www.wiedenhoff.nu/galaxy/galax2.htm
www.wiedenhoff.nu/galaxy/galax2.htm
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Government of Canada / Gouvernement du Canada ... Canada's Digital Collections ... Les Collections numérisées du Canada...
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collections.ic.gc.ca/universe/galaxies_answers01.html
collections.ic.gc.ca/universe/galaxies_answers01.html
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Hubble Classification of Galaxies Spirals (Ordinary & Barred) Ellipticals Irregulars ... All bright galaxies fall into one of three broad classes according to their shape: ... Types: Sa, Sb, and Sc...
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www.astronomy.ohio-state.edu/~pogge/Ast162/Unit4/types....
www.astronomy.ohio-state.edu/~pogge/Ast162/Unit4/types.html
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Three basic types of Galaxies: ... All bright galaxies fall into one of three broad classes according to their shape: ... Note that these are the fraction of galaxies of those types amongst a sample of the brightest galaxies relatively near the Milky Way.
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www.astronomy.ohio-state.edu/~depoy/courses/ASTH162_LEC...
www.astronomy.ohio-state.edu/~depoy/courses/ASTH162_LECTURE_NOTES/Unit4/types.html
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There are three kinds of galaxies. One is a spiral galaxy (such as the Milky Way). This kind of galaxy is shaped like a giant spinning wheel, and has curved arms coming out of the center of it. There are three types of spiral galaxies.
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library.thinkquest.org/J002231F/Galaxies/typesofgalaxie...
library.thinkquest.org/J002231F/Galaxies/typesofgalaxies.htm
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