Question

1. what is a galaxy?

Explanation:

A galaxy is a vast system consisting of stars, stellar remnants, interstellar gas, dust, and dark matter. It is held together by gravitational forces. Galaxies come in various shapes such as spiral (like our Milky Way), elliptical, and irregular. They can range in size from a few thousand to hundreds of thousands of light - years in diameter.

Answer:

A galaxy is a huge collection of stars, gas, dust, and dark matter held together by gravity.