Lenticular galaxies are sort of an intermediate class between elliptical and spiral galaxies and are classified as S0 or ES in the Hubble system. Hubble was also unaware of the differences between dwarf spheroidal/elliptical galaxies and their larger counterparts, which we’ll get into later. Hubble classified some galaxies that were thought to be elliptical all the way to E7, but we now know that those were just lenticular galaxies viewed at an odd angle. Completely spherical elliptical galaxies are referred to as E0 types, flattening out to more oval or American football-shaped galaxies as E1, E2, and so on all the way to E4. Hubble’s system of classifying elliptical galaxies is not based on size, spectrum, or origin but rather on shape and structure (more commonly referred to as morphology). By contrast, dwarf elliptical galaxies are frequently found circling larger spiral or elliptical galaxies. Giant elliptical galaxies make up some of the largest galaxies in the Universe. This is probably the only classification you’ve ever heard of, but it’s a little incomplete.Įlliptical galaxies are galaxies with little dust and gas left. He came up with a system that is still used today. In 1926, around the same time that it was proven that the odd “spiral nebulae” in the sky and some of the other “faint fuzzies” seen through telescopes were actually separate galaxies or “island universes” from our own, astronomer Edwin Hubble sought to classify these objects. Origins of Galaxy Types & Classification Hubble’s Sequence of Galaxies Starburst galaxies you can see in a telescope.Interacting galaxies you can see in a telescope.Irregular galaxies you can see in a telescope.Lenticular galaxies you can see in a telescope.Lenticular Galaxies (Hubble S0/ES, Yerkes Ep) Magellanic spiral galaxies you can see in a telescope.Flocculent spiral galaxies you can see in a telescope.Barred spiral galaxies you can see in a telescope.Intermediate spiral galaxies you can see in a telescope.Grand Design spiral galaxies you can see in a telescope.Spiral Galaxies (Hubble and Yerkes type S) Dwarf elliptical and spheroidal galaxies you can see in a telescope.Dwarf Elliptical & Dwarf Spheroidal Galaxies (dEs & dSph).Giant elliptical galaxies you can see in a telescope.Galaxy Types In The Modern Galaxy Classification.Bautz-Morgan Galaxy Cluster Classification. Origins of Galaxy Types & Classification.
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