Category: Stars and Galaxies

Stars and galaxies refer to two fundamental components of the universe.

Stars are luminous celestial bodies made primarily of hydrogen and helium that generate energy through nuclear fusion in their cores. This process produces light and heat, allowing stars to shine brightly in the night sky. They vary in size, temperature, and lifespan, with different types including red dwarfs, giants, and supernovae.

Galaxies, on the other hand, are vast systems that consist of stars, stellar remnants, gas, dust, and dark matter, all bound together by gravity. They can contain billions of stars and come in various shapes, such as spiral, elliptical, and irregular. The Milky Way is an example of a spiral galaxy, while others like Andromeda are nearby spiral galaxies.

Together, stars and galaxies make up the large-scale structure of the universe, with galaxies often containing large clusters and superclusters of galaxies, serving as the framework for cosmic evolution and the formation of structures throughout the universe.