They can be yellow, red or blue as we see them. However we only see some as red and blue because of the "Doppler effect". Basically because the universe is always expanding, some stars are moving towards earth and some away. When an object is moving away from you, the light waves get lengthened so we see it as more red than it actually is. When an object is moving towards you the opposite happens, the light waves get shortened and the object appears more blue. The ones that we see as yellow are moving in the same direction and at around the same speed as earth.
Hope this helped.
they get their colors by the different stars in the galaxy
Galaxies can have a wide range of colors depending on the stars they contain and how those stars emit light. Generally, galaxies appear in colors like white, blue, red, and yellow. These colors relate to the age and types of stars present in the galaxy.
There are stars in any galaxy. That's, to a great extent, what a "galaxy" is all about: a huge collection of stars.
All stars are approximately spherical.
All stars you can see are in the Milky Way Galaxy.
No, there are more massive galaxies with stars in them.
Maybe from all stars, thousands of stars, in the galaxy.
A galaxy is by a definition a group of stars. If there were no stars it could not be a galaxy.
depends on all the stars.
Every galaxy contains stars, if that's what you mean. "Galaxy" means "big bunch of stars". No stars ===> no galaxy.
Spiral galaxies tend to have blue colors due to the presence of young, hot stars that emit blue light. Elliptical galaxies, on the other hand, are typically redder in color because they contain older stars that emit more red light. This color contrast is a result of the different star formation histories and compositions of the two types of galaxies.
Every galaxy has billions of stars. Each of those stars is like the Sun, but some are larger or smaller, and they can have different colors.