All galaxies contain hot blue stars...
Yes. Millions of blue stars exist in our galaxy alone.
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.
If it didn't have stars it wouldn't be a galaxy
Stars form in all parts of our galaxy - not just the "arms". Stars do indeed form in the central bulge. The vast majority of hot, young, blue stars are formed in the arms, but stars also form in the central bulge as well.
If a galaxy shows any significant colour band, then it is due to the type of stars present in that galaxy. A blue or white galaxy would have to have a predominant amount of OB stars to project that colour band.Spiral galaxies do not have significantly greater amounts of OB stars, so it is only a "visual" appearance, not a factual one.
The answer is Galaxy. a circular collection of stars is a galaxy
There are about 200 -> 400 billion stars in our Galaxy
the milky way is everybodys galaxy and yes the stars you see are in your galaxy
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.
Elliptical galaxies mostly consist of a collection of older red stars in the center, with blue and white stars located in the outer regions. This is because elliptical galaxies have a smooth, featureless appearance and are dominated by older stellar populations in their central regions.