Mainly because the distances are so great (the Milky Way galaxy is 100,000 light years wide and a thousand light years thick) but also a segment of the Milky Way is obscured from observation. (Observational shadow).
There are also a lot, over 200 billion stars in our galaxy.
An average A4 page contains about 3,000 characters with spaces. To fill a book with a star per character, you would need about 67 million pages.
Galaxies can be classified into three main sizes: dwarf galaxies, which are small and contain less than a few billion stars; Milky Way-sized galaxies, which are intermediate in size and contain a few hundred billion stars; and giant galaxies, which are massive and can contain trillions of stars.
The question is essentially nonsense. The universe is the universe. It contains galaxies. There's no underlying "structure" to how the galaxies fit together, so it's more or less meaningless to talk about "how they make up the universe."
The further away they are, the further back in time you see them. Such distant galaxies are much younger than ours, which is also evidenced via their chemical evolution.
Galaxies do exert significant gravitational attraction on other galaxies. For example, the Greater and the Lesser Magellanic Clouds are galaxies that orbit our own galaxy, the Milky Way. In that sense, the stars in one galaxy do have a gravitational interaction with those in other galaxies. Of course, the more distant galaxies have correspondingly less gravitational interaction with ours.
There are generally three types of galaxies: spiral galaxies, elliptical galaxies, and irregular galaxies. Spiral galaxies like the Milky Way have a disk shape with arms of stars spiraling out from a central core. Elliptical galaxies are shaped like ellipses and contain mostly older stars. Irregular galaxies have a less defined shape and tend to have a mix of young and old stars.
There is no such thing as a black hole with the mass of a galaxy. At least, none that we know of, and not if you are thinking of a large galaxy like the Milky Way. The largest known black hole has about 20 billion solar masses - which is still much less than the mass of a typical galaxy. For example, our Milky Way is estimated to have a mass of about 700 billion solar masses. However, such as massive black hole does have a mass comparable to smaller galaxies, i.e., dwarf galaxies. In any case, such huge black holes are found in the center of large galaxies.
It isn't even clear how many dwarf planets our own Solar System has (it may be some tens of them, hundreds, or even thousands) - much less how many there are in the entire Milky Way or in other galaxies.
Dwarf galaxies are small galaxies that exhibit a wide variety of shapes and structures. They can be irregular, elliptical, or even spiral in some cases, depending on their formation history and interactions with larger galaxies. Examples include the Large and Small Magellanic Clouds, which are irregular dwarf galaxies near the Milky Way. These galaxies often contain fewer stars and less gas than their larger counterparts, contributing to their diverse appearances.
Dwarf galaxies are small galaxies that contain relatively few stars compared to larger galaxies, typically having a total stellar mass of less than a billion solar masses. They can be classified into different types, such as dwarf elliptical, dwarf irregular, and dwarf spheroidal galaxies. Despite their small size, dwarf galaxies can play a significant role in our understanding of galaxy formation and evolution, as well as dark matter. They often exist in groups or clusters and can be satellites of larger galaxies, like the Milky Way.
Galaxies in the universe have different names based on their shape and structure. Some common types of galaxies include spiral galaxies, elliptical galaxies, and irregular galaxies. Each type has its own unique characteristics and features.
Probably more or less the same things that you will find in our own galaxy.
the galaxy that contains no blue stars is I DO NOT KNOW and i would like to know the answer too