Galaxy

Galaxies are large systems of stars, gas, and dust held together by gravity. They come in many different shapes and sizes including spiral, elliptical, and irregular. The Milky Way is our home galaxy and contains over 200 billion stars. Galaxies can also collide and merge with one another, reshaping their structures and forming new stars. The study of galaxies has led to a deeper understanding of the universe and the evolution of galaxies over time.