This compression triggers the collapse of the gas into new stars, which is why the arms shine brightly in ultraviolet and infrared wavelengths. The bulge is a tightly packed group of older stars that often contains a supermassive black hole at its core.
Spiral Galaxies Definition Versus Other Galaxy Types: Key Differences
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. The primary components include the central bulge, the disk, and the halo.
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. 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.
Spiral Galaxies Definition Versus Other Galaxy Types
In contrast, barred spirals possess a bar-shaped structure of stars running through their center, from which the spiral arms emerge. 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.
