How do we know what the galaxy looks like and what methods are used to study its appearance?

Scientists use telescopes to study the appearance of the galaxy. They observe light emitted by stars, planets, and other celestial objects to create images and maps of the galaxy. Different types of telescopes, such as optical, radio, and infrared telescopes, are used to study different aspects of the galaxy. By analyzing the light and data collected from these telescopes, scientists can determine the structure, composition, and appearance of the galaxy.