A class of galaxy, spiral galaxies are so named because of their spiral shape. Spiral Galaxy
Any of a large class of galaxies exhibiting a disk with spiral arms.
A galaxy with a prominent nuclear bulge and luminous spiral arms of gas, dust, and young stars that wind out from the nucleus.
A type of galaxy in which many of the stars and nebulae lie in spiral arms.
large system of stars and interstellar matter having the shape of a flattened disk with outlying spiral arms.
a highly flattened galaxy with a disk and a central bulge. The disk has a spiral pattern with slightly more stars and gas than in the rest of the disk. A slow, steady star formation rate means that they still have gas and dust left in them from which stars are still forming. The star orbits are constrained to stay within a small distance from the mid-plane of the disk and have small eccentricities.
type of galaxy with spiral arms. Includes both normal spirals () and barred spirals ( SB, spirals with a "central bar"). Both types are categorized into subtypes such as Sa and SBa (tightly wound arms and relatively large central bulge); Sb and SBb; and Sc and SBc (loose arms with a small central bulge). (Type Sd is even more extreme while Sm refers to no nuclear bulge.) Spiral galaxies are also typed by coherence and strength of the spiral arms: (well formed globular spiral) to .
a galaxy having a spiral structure; arms containing younger stars spiral out from old stars at the center
a cluster of stars and other celestial matter that revolves around a center (often a black hole ) in at least two arms
a galaxy which contains two or more spiral arms which extend out from the nucleus
a galaxy with a dense central area and spiraling arms
a group of millions of stars that swirl in a spiral shape, like our Milky Way galaxy)
a type of galaxy in the hubble sequence which is characterized
A flattened, rotating galaxy with pinwheel-like arms of interstellar material and young stars winding out from its nucleus.
A galaxy consisting of a flattened rotating disk of young stars, a central bulge of generally older stars, and a surrounding halo of older stars and dense clusters of old stars called globular clusters. The disk is prominent due to the presence of young, hot stars in a spiral pattern.
A galaxy with spiral arms and a high population I component. M51 in Canes Venatici is a stunning example of a face-on spiral galaxy. Barred spiral galaxies show a central bar running through the nuclear region. NGC 7479 in Pegasus displays classic barred spiral features in my 10-inch.
The second major type of galaxy, characterized by a central bulge and a number of spiral arms extending from the bulge. See also elliptical galaxy.
galaxy with spiral arms. There are two main types, those with central bar - SB, and those without - S (or SA). Spiral galaxies are also subdivided into types a, b, c (and sometimes d), depending on how tightly wound the spiral arms are.
Galaxy composed of a flattened, star-forming disk component which may have spiral arms and a large central galactic bulge.
A galaxy that contains a prominent central bulge and luminous arms of gas , dust, and young stars that wind out from the central nucleus in a spiral formation. Our galaxy, the Milky Way, is a spiral galaxy.
A galaxy characterized by arched lanes of stars and glowing nebulae.
Spiral galaxies are galaxies with a central, dense area and spiraling arms. There are two types of spiral galaxies, "S" (normal spiral) and "SB" (barred spiral, with an elongated center). The Milky Way and M31 (commonly known as Andromeda Galaxy) are two of a multitude of known spiral galaxies.
A galaxy with the shape of a flat circular disk in which the stars are distributed in a spiral pattern. Andromeda (Spiral galaxy)
galaxy with spiral arms; the presumed shape of our Milky Way galaxy.
A disk-shaped galaxy having a spiral or pinwheel pattern, some more than others, and composed of a mixture of old and young stars as well as loose interstellar matter.
A galaxy with an obvious disk component containing gas; dust hot, bright stars; and spiral arms.
A spiral-shaped system of stars, dust, and gas clouds. A typical spiral galaxy has a spherical central bulge of older stars surrounded by a flattened galactic disk that contains a spiral pattern of young, hot stars, as well as interstellar matter.