Stars
It means that a galaxy is made up of millions or billions of stars.
Every galaxy is made up of millions of stars. An elliptical galaxy consists of predominately old stars,. See related question.
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No, you just made that up.
Our galaxy, the Milky Way, is itself a galaxy, made up of approx. 200 billion stars. There are no other galaxies within our own.
The Andromeda galaxy is made up of stars, gas, and dust. It has a vast number of stars, with estimates ranging from hundreds of billions to over a trillion. The gas and dust in the galaxy play a crucial role in the formation of new stars.
Galaxy
The Milky Way is a Galaxy.
The Solar System.
In our Milky Way galaxy, globular clusters tend to be at the "outlying fringes" or "halo" of the galaxy, and seem to be largely made up of very old stars.
A galaxy is made from matter that was put together after the Big Bang, which was supposed to be caused by all the matter blowing up from a confined space a long time ago.