Spiral Galaxy

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In a spiral galaxy, the stars, gas and dust are gathered in spiral arms that spread outward from the galaxy's center.

Spiral galaxy. Spiral galaxy definition, a galaxy having a spiral structure. A spiral galaxy is a type of galaxy characterized by a central bulge of old Population II stars surrounded by a rotating disc of younger Population I stars. Bright knots of glowing gas light up the spiral arms, indicating a rich environment of star formation.

Most spiral galaxies contain a supermassive black hole in the center of the central bulge. Spiral galaxys are divided into three main types depending on how tightly wound their spiral arms are:. A galaxy with very tightly wound arms, such the left galaxy in the list above, would be called "type a." galaxy A "type b" galaxy has more loosely wound arms.

These arms are thought to be produced by traveling density waves, which compress and expand the galactic material. Spiral galaxies form a class of galaxy originally described by Edwin Hubble in his 1936 work The Realm of the Nebulae and, as such, form part of the Hubble sequence.Most spiral galaxies consist of a flat, rotating disk containing stars, gas and dust, and a central concentration of stars known as the bulge.These are often surrounded by a much fainter halo of stars, many of which reside in. Along with the other types of galaxy, the Spiral galaxy was first defined by Edwin Hubble in 1936.

Sa galaxies have very tightly wound arms around. A spiral galaxy maintains its spirals arms due to density wave theory. The classification column refers to the galaxy morphological classification used.

Spiral galaxies are further classified by how tight their arms are e.g. Spiral galaxies tend to be the brightest galaxies in the universe. Resembling festive lights on a holiday wreath, this NASA/ESA Hubble Space Telescope image of the nearby spiral galaxy M74 is an iconic reminder of the impending season.

A "type c" galaxy (such as the middle one above) has very loosely wound arms. Below is a list of notable spiral galaxies with their own articles. Spiral galaxies are twisted collections of stars and gas that often have beautiful shapes and are made up of hot young stars.

Spiral galaxies—of which the Milky Way system is a characteristic example—tend to be flattened, roughly circular systems with their constituent stars strongly concentrated along spiral arms. Spiral galaxies get their name from the shape of their disks. Spiral galaxies are mostly found in low-density regions, and very rarely at the center of galaxy clusters.

Most of the galaxies that scientists have discovered so far are spiral. The center of a spiral galaxy is something we call the Bulge, which is a very large group of stars, giving a super bright appearance.

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