Yes they do.
See related question.
they usually use super computers
By translating the math model of a galaxies and a galaxy collisions into a simulation. And theoritically observe the process by experimenting with the variables.
With current technology, astronomers are able to detect objects (galaxies) out to about 14 billion light years from us in every direction. We don't know what's farther than that.
An astronomer is a scientist who studies celestial bodies (planets, stars, black holes, moons, nebulae, galaxies).
Astronomers Believe That The Solar System Began As A Huge Cloud Of Dust And A Gas Called ''NEBULA''
Galaxies. They are just about the same now as they were then. 14 Billion years ago, astronomers believe that the "Big Bang" created matter from energy, which is how they believe galaxies were formed.
astronomers did
Perhaps in the future astronomers will do all the redshifts of the 100 billion galaxies in the universe.
That the galaxy is moving away from us.
It is possible that someday astronomers will measure all the distances of the 100 billion galaxies in the universe.
most of the mass in a cluster of galaxies is invisible, which provides astronomers with the strongest evidence that the universe contains a great amount of DARK MATTER
most of the mass in a cluster of galaxies is invisible, which provides astronomers with the strongest evidence that the universe contains a great amount of DARK MATTER
There is no answer
Billions. (rounded)
They were discovered by astronomers using telescopes.
It highly likely that astronomers will name all the designations of the 100 billion galaxies in the universe in this lifetime.
Maybe someday in the future astronomers will get all the J2000 coordinates of the 100 billion galaxies in the universe.