![]() ![]() And just as our Earth is composed of a myriad of materials that are unique to Earth, each galaxy is composed of a mix of gas, dust, and stars that are unique to that galaxy. Just like there are dense populations of people, there are dense populations of stars. Depending on their location on our planet and their position relative to the Sun, these ecosystems range from hot and steamy to bitterly cold and blustery. The planet is composed of different types of ecosystems. When we define our planet, we consider things such as gravity, the core, the atmosphere, and the surface that is composed of water and landmasses. We can think of a galaxy the same way as we think of Earth. More About Galaxies Abell 2218 galaxy cluster Our universe has a large spectrum of diversity, as some galaxies are extremely complex and others quite simple. The universe is made of different galaxies that are the basic units of the universe. Our galaxy, like our solar system, is in constant motion. ![]() It has large spiral arms with a bulging disk and bar of stars in the center. Our galaxy is a barred spiral galaxy and is called the Milky Way. This is called a “cosmic year” or “galactic year.”Įach galaxy has its own collection of stars, planets, black holes, neutron stars, moons, nebulae, asteroids, comets, and dark matter.
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