Smoking and tasting beer behind the woodshed.
Not all galaxies, but it is believed that the majority of galaxies have central black holes.
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 far too many to count or name
Yes, there are stars between galaxies. When there are collisions or interactions between galaxies, stars can be ripped out of the galaxies. These stars will then wander into space between galaxies. Such stars have been observed with the Hubble Space Telescope. Taken from http://curious.astro.cornell.edu/question.php?number=384
Probably, but impossible to tell as we are only just seeing planets within our own galaxy.
who discovered the galaxies who discovered the galaxies
Galaxies, such as the Milky Way and Andromeda, are sources of light that have been found to be collections of billions of stars rather than individual stars. These galaxies contain vast numbers of stars, dust, and gas held together by gravity.
Because that is what galaxies are "made" up of.
They are simply called "galaxies which are part of a cluster".
Irregular galaxies are believed to have been spiral or elliptical galaxies in the past, which have been distored through gravitational pull of neighboring galaxies.
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
Most likely not. The best evidence of the existence of black holes has been found deep within 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