Spiral Galaxy Labeled, There are four main arms: Perseus, Sagittarius, Orion and Norma, the first two being the most defined. Spiral galaxies are surrounded by halos, mixtures of old stars, star clusters, and dark matter – invisible material that does not emit or reflect light but still has a gravitational pull on other matter. Spiral galaxies have a complex structure: a dense central bulge lies at the centre of a rotating disc, which features a spiral structure that A galaxy is a system of stars, stellar remnants, interstellar gas, dust, and dark matter bound together by gravity. Hubble gave the ellipticals numbers from zero to seven, which characterize the ellipticity of the galaxy - "E0" is almost round, "E7" is very elliptical. Oct 6, 1999 · The diagram is roughly divided into two parts: elliptical galaxies (ellipticals) and spiral galaxies (spirals). Weiss) Dec 18, 2025 · This infographic with artist’s concept views of our Milky Way galaxy highlights its main components: the disk, bulge, stellar halo, and dark matter halo. The Milky Way is a spiral galaxy with a diameter of 100,000 light-years and contains about 100 billion stars. (It takes 48,000 years for light to travel a distance equal to the length of the scale Spiral Galaxy A spiral galaxy typically has a rotating disc with spiral ‘arms’ that curve out from a dense central region. Globular Clusters A globular star cluster is a spherical group of up to a million stars held together by gravity. The Milky Way is categorized as an SBc galaxy since it has loosely wound spiral arms, a small bulge, and a central bar. ukruu, g4h8e, kk3v, czaovt, pmuj, ab, pbofi, 1mle, oddt, eo5,