Finally, the halo is a roughly spherical region of sparse stars and dark matter that extends far beyond the visible disk, providing the gravitational scaffolding necessary to hold the galaxy together. NGC 7743 S or SBb Moderately wound arms with a noticeable but not dominant bulge.
Spiral Galaxies Definition Disk Geometry Views
These arms are sites of active star formation, appearing blue due to the presence of hot, young stars, and they define the primary classification of a spiral galaxy. A common system, known as the Hubble tuning fork diagram, divides them into two main types: normal spirals (S) and barred spirals (SB).
This disk is where the majority of the galaxy's gas and dust is located, and it is the principal region for ongoing stellar birth. A spiral galaxy is a classification of galaxy characterized by a flat, rotating disk containing stars, gas, and dust, along with a central concentration of stars known as the bulge.
Spiral Galaxies Definition Disk Geometry Views
The primary components include the central bulge, the disk, and the halo. M33, M100 Formation and Evolution.
More About Spiral galaxies definition
Looking at Spiral galaxies definition from another angle can help expand the discussion and give readers a second clear paragraph under the same section.
More perspective on Spiral galaxies definition can make the topic easier to follow by connecting earlier points with a few simple takeaways.
