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Milky Way Galaxy's spiral arms and barred core – based on WISE data. The Milky Way was once considered an ordinary spiral galaxy. Astronomers first began to suspect that the Milky Way is a barred spiral galaxy in the 1960s.
A ring galaxy is thought to occur when a smaller galaxy passes through the core of a spiral galaxy. [97] Such an event may have affected the Andromeda Galaxy, as it displays a multi-ring-like structure when viewed in infrared radiation. [98] A lenticular galaxy is an intermediate form that has properties of both elliptical and spiral galaxies.
Image of spiral galaxy M81 combining data from the Hubble, Spitzer, and GALEX space telescopes.. Density wave theory or the Lin–Shu density wave theory is a theory proposed by C.C. Lin and Frank Shu in the mid-1960s to explain the spiral arm structure of spiral galaxies.
NGC 1300, viewed nearly face-on; Hubble Space Telescope image. A barred spiral galaxy is a spiral galaxy with a central bar-shaped structure composed of stars. [1] Bars are found in about two thirds of all spiral galaxies in the local universe, [2] and generally affect both the motions of stars and interstellar gas within spiral galaxies and can affect spiral arms as well.
Spiral galaxy – Class of galaxy that has spiral structures extending from their cores; Galactic coordinate system – Celestial coordinate system in spherical coordinates, with the Sun as its center; Galactic halo – Spherical component of a galaxy which extends beyond the main, visible component
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. A spiral galaxy maintains its spiral arms due to density wave theory.
CEERS-2112 is a barred spiral galaxy, resembling the structure of the Milky Way. It presents a concentration of stars moving on very elliptical orbits in its central region, which appears as an elongated structure (stellar bar), from which two faint spiral arms develop.
A spiral galaxy is organized into a flat, rotating disk, usually with a prominent bulge or bar at the center, and trailing bright arms that spiral outward. The arms are dusty regions of star formation within which massive young stars produce a blue tint. Spiral galaxies are typically surrounded by a halo of older stars.