Hubble tuning fork
![hubble tuning fork hubble tuning fork](https://briankoberlein.com/post/hubbles-tuning-fork/fork_hu48e84be43908b35b3f0b882af65a9fb2_60793_300x0_resize_q75_box.jpg)
These galaxies are generally referred to as irregular galaxies, classified as Irr.Įlliptical and lenticular galaxies are often referred to as early-type galaxies, while spirals and irregular galaxies are referred to as late-type. Lenticular galaxies, classified as S0, are a type of galaxy intermediate between elliptical and spiral galaxies.įinally, some galaxies do not fit into any category. The Hubble tuning fork, illustrated with images taken by the Faulkes Telescope North tuning fork image compiled by the Las Cumbres Observatory Global Telescope. the formation of Hubbles tuning fork to be mapped out to high redshifts. Number of times this content has been viewed 36 Button to like this content Button to share content Button to report. Barred spiral galaxies have a B in their classification. of galactic structure that maps closely onto Hubbles original tuning fork. Spiral galaxies are then divided into two sub-categories: unbarred and barred spiral galaxies, referring to whether or not the spiral galaxy has a bar of stars running through its centre. Elliptical galaxies look like smooth blobs in the sky and lie on the handle of the fork. The Hubble Tuning Fork is used to classify galaxies according to their morphology. Hubble assigned spiral galaxies letters from a to c, which tell us how compact the spiral arms are. This galaxy is known as Mrk 820 and is classified as a lenticular galaxy type S0 on the Hubble Tuning Fork. Ellipticals were assigned numbers from zero to seven, referring to how elliptical the galaxy is ( E0 is very round, E7 is very elliptical). In the Hubble tuning-fork, galaxies are roughly separated into two categories: elliptical and spiral galaxies. Elliptical galaxies make up the branch on the left while the spirals and the barred spirals make up the 'prongs' of the fork. This scheme is called the Hubble Sequence or Hubble tuning-fork diagram because the shape in which it is usually shows resembles a tuning-fork, like the images below. The tuning fork diagram was first drawn by Edwin Hubble as a way of describing galaxies by how they look. In 1926, the American Astronomer Edwin Hubble developed a classification scheme of galaxies based on their shapes and structure, or in other words, on their morphology.