Question

Verbal to Non-verbal :The most widely used classification scheme for galaxies is based on one devised by Edwin P. Hubble and

further refined by astronomer Gerard de Vaucouleurs. Spiral galaxies are the most common type in the

universe. Our Milky Way is a spiral, as is the rather close-by Andromeda Galaxy.Spirals are large rotating disks of stars and nebulae, surrounded by a shell of dark matter. The central

bright region at the core of a galaxy is called the “galactic bulge”. Many spirals have a halo of stars and

star clusters arrayed above and below the disk.

Many spirals may also contain supermassive black holes in their cores.

Elliptical galaxies are roughly egg-shaped (ellipsoidal or ovoid) found largely in galaxy clusters and

smaller compact groups. Most ellipticals contain older, low-mass stars, and because they lack a great

deal of star-making gas and dust clouds, there is little new star formation occurring in them.

Irregular galaxies are as their name suggests: irregular in shape. The best example of an irregular that

can be seen from Earth is the Small Magellanic Cloud. Irregulars usually do not have enough structure to

characterise them as spirals or ellipticals. They may have active regions of star formation, and some

smaller ones are listed as “dwarf irregulars”, very similar to the very earliest galaxies that formed about

13.5 billion years ago.​

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