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Their mutual gravitational attraction.
The gravitational attraction of other stars in the galaxy and, possibly, that of a black hole in the centre.
Yes, Polaris is moving, as are all stars in the galaxy.
There are about 200 -> 400 billion stars in our Galaxy
power
Yes. Every star has a "proper motion", which is their motion relative to the solar system. Some stars are moving toward us, while others are moving away. Nothing is standing still. Of course, the Earth is moving around the Sun, and the Sun is orbiting the center of the galaxy, and the Milky Way galaxy itself is moving - but we can't know where. Every other galaxy is moving too, and there isn't a way to identify where the Big Bang started.
it include an infinity amount of stars because it keeps making stars abd stars die
trillions of other stars in the milkyway
yes
Stars are suns, We are in the Milkey Way Galaxy, We have only one Star. There are BILLIONS and BILLIONS of Stars in space.
A galaxy is by a definition a group of stars. If there were no stars it could not be a galaxy.
All of the stars in the Milky Way Galaxy are moving... however, we, in our lifetime, will never notice the constellations changing.
We expect the Andromeda galaxy to be just like our own Milky Way galaxy. We can see stars (suns) in the Andromeda Galaxy and just as stars have planets orbiting them in our galaxy, we believe that there must be planets also orbiting stars in the Andromeda galaxy.
Every galaxy contains stars, if that's what you mean. "Galaxy" means "big bunch of stars". No stars ===> no galaxy.