I'm not sure of your question, but in astronomy, there is a "Local Group" of more than 20 galaxies to which the Milky Way belongs. About half are elliptical, with the remainder being of the spiral or irregular type. As in other clusters of galaxies, members are probably kept from separating by their mutual gravitational attraction. The Milky Way system is near one end of the volume of space occupied by the Local Group, and the great Andromeda galaxy (M31) is near the other end, about 2,000,000 light-years away.
Some names I've heard are:
The observeable universe
The local universe
Virgo Cluster
the solar system
The milky way
The estimated number of satellite galaxies, given that there are 100 billion galaxies in the universe, is 170 billion.
a telescopeIn 1925, Edwin Hubble discover cepheid variable(s) in what we now call the Andromeda Galaxy. From those he could tell that the group of stars was too far away to be part of the Milky Way. It was the first proof that other galaxies exist.
A cluster or star cluster
It is a constalation
Nebulae
A "cluster".
umbells
No. M or Messier is a name given to certain nebulae and galaxies.
It's not that the universe is made of up "galaxies" and that an exact "percent" can be given in the way that you are thinking, but the Hubble Telescope estimates that the universe is actually occupied by hundreds of billions of galaxies (maybe even more!).
Your name.
The estimated number of galaxy mergers, given that there are 100 billion galaxies in the universe, is 100 billion.