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spiral galaxy definition

noun A galaxy in which the stars and gas clouds are concentrated mainly in one or more spiral arms. ‘The new Whirlpool Galaxy image shows the spiral galaxy's classic features, from its curving arms, where newborn stars reside, to its yellowish central core that serves as home for older stars.’

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spiral galaxy | definition of spiral galaxy at

a galaxy consisting of an ellipsoidal nucleus of old stars from opposite sides of which arms, containing younger stars, spiral outwards around the nucleus. In a barred spiral the arms originate at the ends of …

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spiral galaxy facts & definition | space

Nov 20, 2018 · Spiral galaxies are twisted collections of stars and gas that often have beautiful shapes and are made up of hot young stars. Most of the galaxies that scientists have discovered so …

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spiral galaxy - definition of spiral galaxy by the free

spiral galaxy. (Astronomy) a galaxy consisting of an ellipsoidal nucleus of old stars from opposite sides of which arms, containing younger stars, spiral outwards around the nucleus. In a barred spiral, the arms originate at the ends of a bar-shaped nucleus

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spiral galaxy | astronomy | britannica

In galaxy: Spiral galaxies Spirals are characterized by circular symmetry, a bright nucleus surrounded by a thin outer disk, and a superimposed spiral structure. They are divided into two parallel classes: normal spirals and barred spirals

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what is a spiral galaxy? | cool cosmos

In a spiral galaxy, the stars, gas and dust are gathered in spiral arms that spread outward from the galaxy's center. Spiral galaxys are divided into three main types depending on how tightly wound their spiral arms are: Sa, Sb and Sc. Sa galaxies have very tightly wound arms around a larger central nucleus

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spiral galaxies - sdss skyserver dr16

The most common type of galaxy is called a "spiral galaxy." Not surprisingly, spiral galaxies look like spirals, with long arms winding toward a bright bulge at the center. But be careful - if you looked at a spiral galaxy from the side, you could mistake its shape for a circle, and so you'd have to use other criteria to learn it was a spiral

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barred spiral galaxy | definition of barred spiral galaxy

A spiral galaxy with a barlike bulge in the center, extending between the core and the spiral arms. About a third of spiral galaxies have this straight bar of stars, gas, and dust extending out from the nucleus. As …

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use spiral galaxy in a sentence | spiral-galaxy definition

Definition of spiral galaxy. : a galaxy exhibiting a central nucleus or barred structure from which extend curved arms of higher luminosity — called also spiral nebula. What are some examples of spiral galaxies? Most spirals are luminous

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what does spiral galaxy mean?

A spiral galaxy is a certain kind of galaxy originally described by Edwin Hubble in his 1936 work The Realm of the Nebulae and, as such, forms part of the Hubble sequence. Spiral galaxies consist of a flat, rotating disk containing stars, gas and dust, and a central concentration of stars known as the bulge

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spiral galaxy definition by babylons free dictionary

A spiral galaxy is a certain kind of galaxy originally described by Edwin Hubble in his 1936 work The Realm of the Nebulae and, as such, forms part of the Hubble sequence. Spiral galaxies consist of a flat, rotating disc containing stars, gas and dust, and a central concentration of stars known as the bulge

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spiral galaxy lesson for kids: definition & facts

A spiral galaxy is a galaxy that is shaped like a spiral, with a bulge in the center. Our Milky Way galaxy is a barred spiral galaxy , which means it has a bright line going through its center

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galaxy: definition & types - science class [2021]

Jul 20, 2020 · Spiral galaxies have a central bulge of primarily older stars from which spiral arms containing younger stars extend outwards and a nearly imperceptible spherical halo surrounding the …

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sb galaxy | astronomy | britannica

spiral galaxies. In galaxy: Sb galaxies. This intermediate type of spiral typically has a medium-sized nucleus. Its arms are more widely spread than those of the Sa variety and appear less smooth. They contain stars, star clouds, and interstellar gas and dust

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barred spiral | definition of barred spiral by merriam-webster

: a spiral galaxy whose arms apparently spring from the extremities of a luminous bar that extends across the nucleus giving the object somewhat the appearance of a letter S Love words? You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary

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galaxy - simple english wikipedia, the free encyclopedia

A spiral galaxy is a galaxy that has a spiral shape. Most of the galaxies in the universe observed by astronomers are spiral galaxies (about 77%). They are divided into two : Barred spiral galaxy (classified as "SB") Unbarred spiral galaxy (classified as "SA") NGC 1300 and NGC 1672 are examples of …

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spiral galaxy | example sentences - cambridge dictionary

A spiral galaxy consists of a bulge of stars at the centre with a vast disc of stars orbiting around the central group

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10 barred spiral galaxy facts - how they're different

Aug 02, 2020 · A barred spiral galaxy is just the name that we have for the appearance of a galaxy, with a bar in it’s center. It just so happens that the Milky Way, where our solar system is located, is a barred spiral galaxy. We can tell this through several different things, from the dust content and color of our galaxy, to the velocity of the stars

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spiral galaxy definition and meaning | collins english

noun a galaxy consisting of an ellipsoidal nucleus of old stars from opposite sides of which arms, containing younger stars, spiral outwards around the nucleus. In a barred spiral, the arms originate at the ends of a bar-shaped nucleus

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elliptical galaxies | space

While spiral galaxies are bright, elliptical galaxies are dim. Spiral galaxies are hotbeds of star formation, but elliptical galaxies aren't nearly as prolific because they contain less gas and

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spiral galaxies - definition of spiral galaxies by the

spiral galaxy. (Astronomy) a galaxy consisting of an ellipsoidal nucleus of old stars from opposite sides of which arms, containing younger stars, spiral outwards around the nucleus. In a barred spiral, the arms originate at the ends of a bar-shaped nucleus

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spiral galaxy : definition of spiral galaxy and synonyms

spiral galaxy (n.) 1. a galaxy having a spiral structure; arms containing younger stars spiral out from old stars at the center

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