Question

what is mean by galaxy and what is there in galaxy​

Answer 1

Explanation:

A galaxy is a collection of stars and planets that are held together by gravity. In a galaxy, the celestial bodies rotate around a central object. The Earth's galaxy is known as the Milky Way. Our solar system, made up of the Sun and the planets that encircle it, is a tiny part of that galaxy.

Answer 2

A galaxy is a huge collection of gas, dust, and billions of stars and their solar systems, all held together by gravity. ... A galaxy is a huge collection of gas, dust, and billions of stars and their solar systems. A galaxy is held together by gravity.