Galaxies are visible to the naked eye, so early observers no doubt saw them. But without telescopes, even the sharpest vision only showed them a small smudges in the sky.
In the late 1700s, the French astronomer Charles Messier couldn't have cared less about other galaxies, and in fact, didn't know what they were. Messier was a comet hunter, and finding comets was his great joy in life. To speed his discovery of potential comets, Messier created a catalog of smudgy comet-like things in the sky that were NOT comets, so that he could quickly reject them the next time he saw them.
These Messier Catalog objects were, predominantly, other galaxies, and many of the galaxies that we still study are named or referenced by their numbers in Messier's catalog. For example, the Great Nebula in Andromeda, sometimes called the "Andromeda galaxy", is item number 31 on Messier's list; M31 in Andromeda.
who discovered the galaxies who discovered the galaxies
Because that is what galaxies are "made" up of.
They are simply called "galaxies which are part of a cluster".
Most galaxies, even our own, are found in groups or clusters. For example, the Local Group contains several galaxies including the Milky Way, Andromeda, and the Magellanic clouds.
Most of them are found at the center of the galaxies.
Nebulae are found in most galaxies
They are found near other irregular galaxies.
There are galaxies and nebula in every direction, including Aquarius.
They are formed at the SHlT center
Yes, because scientists have found hundreds and hundreds of galaxies already and scientists say that there are more galaxies out there that they haven't found!
Not all galaxies, but it is believed that the majority of galaxies have central black holes.
At least 3 or 4 galaxies can be seen with the naked eye. Other galaxies can be seen if you watch through a telescope. Basically, in any direction you look, there are galaxies.