Lee universe online practice how are galaxies classified by their saved by the location within the universe by their size by the age of their Stars
Galaxies are primarily classified by their shape and structure rather than their location within the universe. The most common types of galaxy classifications are based on their morphology, which include:
1. Elliptical Galaxies: These galaxies have a smooth and rounded shape, resembling an ellipse. They lack well-defined spiral arms and generally contain older stars.
2. Spiral Galaxies: Spiral galaxies have a rotating disk-like structure with prominent arms spiraling out from a central bulge. These galaxies often have a more active star formation rate and contain a mixture of young and old stars.
3. Barred Spiral Galaxies: These galaxies have a central bar-like structure crossing their nucleus, which separates the arms. They can be similar in structure to spiral galaxies, but with a distinct bar at their center.
4. Lenticular Galaxies: Lenticular galaxies have a disk-like structure similar to spiral galaxies, but they lack well-defined spiral arms. They are often seen as an intermediate stage between elliptical and spiral galaxies.
5. Irregular Galaxies: Irregular galaxies do not have a well-defined shape and structure. They are usually characterized by a chaotic appearance with no clear symmetry.
It's worth noting that there are some additional classifications based on a galaxy's size, such as dwarf galaxies (smaller and less massive) or giant galaxies (larger and more massive). However, the age of their stars does not play a significant role in the overall classification scheme.