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A spiral galaxy is a type of galaxy with a flat, rotating disk of stars, gas and dust, and a central bulge. It has spiral arms that extend from the center and contain young, blue stars, and may have a bar-shaped structure or a halo of stars and globular clusters.
19 lis 2018 · Spiral galaxies are twisted collections of stars and gas that often have beautiful shapes and are made up of hot young stars. Learn about their structure, formation, evolution and examples, such as the Milky Way and NGC 6872.
30 kwi 2024 · Spiral galaxies are flat, disk-shaped structures with a central bulge and spiral arms made of stars, gas, and dust. They are one of the most common types of galaxies in the universe and have different types, formation theories, and notable examples.
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 are actively forming stars and make up a large amount of all the galaxies in our nearby universe. Spiral galaxies can be further divided into two groups: normal spirals and barred spirals. In barred spirals, a bar of stars runs through the central bulge of the galaxy.
8 sty 2020 · Spiral galaxies are the most common type of galaxies in the universe, with a flat disk, a central bulge, and spiral arms. They are classified by their shape, size, and bar structure, and they contain dark matter halos and supermassive black holes.
A spiral galaxy is a rotating disc with spiral arms that curve out from a dense central region. Learn about the four classes of spiral galaxies, their structure, evolution and how Hubble has observed them.