Yes. All ~100 billion galaxies in the universe come in all shapes, sizes, and colors.
There's an impossible way to classify all the shapes of 100 billion galaxies in the universe.
Someday astronomers may have classified all the shapes of 100 billion galaxies in the observable universe.
Yes. All 100 billion galaxies come in all shapes, sizes, and colors.
It will be impossible when they make all 100 billion reference books that has each all of the descriptions and info on 126,000 sentient species (alien races) of all shapes, sizes, colors, unusual features, etc. in each one of the 100 billion galaxies in the observable universe. Also, it will be 189,000 pages long in each one of them. But for now, it is unknown.
No. They come in different sizes and different shapes, and have other differences as well.
Irregular galaxies have no discernible shape.
The major feature of the Universe is still unknown. Remember that there are black holes too, which can be more massive than some galaxies. A reasonable knowledge of the Universe shall come gradually, when more poweful space telescopes shall be developed, improved.
Spiral and irregular galaxies.
The two main theories of galaxy formation are the bottom-up theory, where galaxies form from mergers of smaller structures like dwarf galaxies, and the top-down theory, where galaxies form from the gravitational collapse of large gas clouds. The hierarchical model is a popular framework that combines aspects of both theories to explain the variety of galaxy shapes and sizes observed in the universe.
Nebulas are found in all types of galaxies, including spiral galaxies like the Milky Way, elliptical galaxies, and irregular galaxies. They are regions of dense dust and gas where new stars are formed. The variety of shapes and sizes of nebulas contribute to the diversity of galaxies in the universe.
There are various ways of categorising galaxies, often based on Edwin Hubble's work on the shapes galaxies. Classifications often give the four main types of galaxies as: Spiral (including barred spiral), Elliptical, Lenticular and Irregular.
Astronomers group galaxies into three types based on their characteristics: spiral galaxies have arms that spiral out from a central bulge, elliptical galaxies are oval-shaped with no distinct structure, and irregular galaxies have a chaotic and asymmetrical shape.