Question

How far apart are galaxies? How many stars are in a galaxy?

Answer 1

It varies somewhat...

Explanation:

If our Local Group of galaxies is typical, then larger galaxies tend to be of the order of a couple of million light years apart, while smaller satellite galaxies can be as close as `20,000` light years or so.

Galaxies come in various shapes and sizes from a few thousand (`3 xx 10^3`) stars up to `100` trillion stars (`10^14`).

Our Milky Way galaxy probably contains somewhere between `100` billion (`10^11`) and `400` billion (`4 xx 10^11`) stars.