Nordica Speedmachine

Most of the galaxies visible in the Universe can be placed into one of three types, based on their shapes. This classification and sorting system was devised by the man who first identified galaxies as something outside our own Milky Way, Edwin Hubble.

The Hubble Sequence of Galaxies

Edwin Hubble measured the distances to "nebulae" in the early 1920s to discover that some nebulae were not gas-and-dust patches in our own galaxy but island universes in their own right. In 1926, he undertook sorting these galaxies into different categories based on appearance. This classification method still stands today and is known as the Hubble Sequence.

Three categories of galaxies are elliptical (spherical and elongated blob-like galaxies), spiral, and barred spiral (a spiral shape with a bar at the center). Galaxies are sometimes also categorized as lenticular and irregular. Irregular are those galaxies which have been warped and deformed by interactions as to fit in no other category. Lenticular galaxies are an intermediate stage between elliptical and spiral, possibly because they are in the midst of changing form or because of the way they are oriented toward Earth they provide an indistinct view for determining their shape.

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