Galaxies

Galaxies are massive systems that consist of stars, stellar remnants, interstellar gas, dust, and dark matter, bound together by gravitational forces. They can range in size from billions of stars to just a few hundred million, and they can vary in shape and structure: the main types are spiral, elliptical, and irregular galaxies. The Milky Way is the galaxy that contains our solar system. Galaxies are fundamental building blocks of the universe, and they can contain various astronomical phenomena such as nebulae, star clusters, and black holes. The study of galaxies is crucial for understanding the formation, evolution, and dynamics of the universe as a whole.