in the halo
solar system
Yes, stars can exist outside of a galaxy. These stars are typically referred to as intergalactic stars, and they may have been ejected from their original galaxy due to interactions with other stars or galactic dynamics. Intergalactic stars are typically found in the space between galaxies.
Most new, young, stars can be found in the arms of spiral galaxies
Large stars are distributed all over our galaxy, there is no single location for them.
A galaxy is by a definition a group of stars. If there were no stars it could not be a galaxy.
Every galaxy contains stars, if that's what you mean. "Galaxy" means "big bunch of stars". No stars ===> no galaxy.
Hydrogen and helium.
Elliptical Galaxy The Elliptical Galaxy has mostly old stars and blue stars are new stars.
No stars are actually a galaxy. All stars are stars and all galaxies are galaxies. Stars are found in galaxies. Some galaxies look like tiny dots in our night sky, so might look like a star, but they are not stars; they are galaxies.
Its an empty vacuum, There is nothing there. Literally nothing.
Population I (High metal content) stars are generally found in the arms of spiral galaxies, whereas population II (Medium metal content) are generally found towards the centre of the galaxies.
If it didn't have stars it wouldn't be a galaxy