Galaxies

Galaxies are vast systems composed of stars, stellar remnants, interstellar gas, dust, and dark matter, bound together by gravity. They can contain billions to trillions of stars, along with a variety of other astronomical objects. Galaxies come in various shapes and sizes, with the main types being spiral galaxies, elliptical galaxies, and irregular galaxies. The Milky Way is an example of a spiral galaxy, while the Andromeda Galaxy is another notable galaxy in our cosmic neighbourhood. Galaxies can also exist in groups or clusters, and they are fundamental components of the universe, playing a crucial role in the formation and evolution of cosmic structures over billions of years. They are studied in astronomy to understand the fundamental processes that shape the universe, including star formation, galactic interactions, and the influence of dark matter and dark energy.