A galaxy is like a gigantic, twinkling city in the sky. Just like a city is full of houses, streets, and lights, a galaxy is filled with stars, planets, and dust. Our home, the Earth, is part of a galaxy called the Milky Way. You can think of the Milky Way as our cosmic neighborhood where the Sun is like the big, warm house we all live in.

Imagine a pinwheel, spinning slowly in the sky. A galaxy can look like that, with its arms swirling around a bright center. The center is like a lighthouse, guiding everything around it. The stars in the galaxy are like tiny fireflies, shining and dancing in the dark night.

Galaxies come in different shapes and sizes, just like different kinds of cookies. Some are round like a ball, others are shaped like a pancake, and some are even a bit messy, like a cloud. Each galaxy is unique, and there are billions of them in the universe, making the sky a magical and endless place.