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How do spiral, barred, and elliptical galaxies form?

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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. read more

A barred spiral galaxy is a spiral galaxy with a central bar-shaped structure composed of stars. Bars are found in approximately two-thirds of all spiral galaxies. Bars generally affect both the motions of stars and interstellar gas within spiral galaxies and can affect spiral arms as well. read more

The two sub categories of spiral galaxies, Spiral galaxies and Barred Spiral Galaxies are further divided into three subclasses each, based on the shape and the structure of the spiral arms. Sa, Sb and Sc are Spiral galaxies subclasses, while SBa, SBb and SBc are barred spiral subclasses. read more

Barred spiral galaxies- appear to have straight bar with spiral arms elongated outwards Lenticular galaxies- galaxies that have the disk and spheroid components but dont have sprial arms Distinguish b/w the disk component and the spheroidal component of a spiral galaxy. read more

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