Astronomy Practice Exam

What defines a Local Supercluster?

1. Large individual stars grouped together

2. Isolated galaxies with no connections

3. Groups of galaxies that are typically clustered

4. Stars that are located in the same galaxy

The correct answer is: Groups of galaxies that are typically clustered

A Local Supercluster is defined as a large group of galaxies that are bound together by gravity, which typically contains multiple galaxy clusters and groups. This definition reflects the cosmic structure of the universe on a larger scale, where these clusters of galaxies are interconnected and often form larger structures with various distributions and interactions. An example of a Local Supercluster is the Virgo Supercluster, which includes our own Milky Way galaxy along with thousands of other galaxies. The gravitational interactions and the spatial relationships between these galaxies contribute to the understanding of cosmic evolution and the distribution of matter in the universe. The other options do not accurately represent the concept of a Local Supercluster. Individual stars grouped together do not define a supercluster, as they can exist independently and do not form the kind of large scale structure that characterizes superclusters. Isolated galaxies with no connections do not fit the definition either, as a Local Supercluster involves many galaxies that are gravitationally bound and thus interconnected. Stars located in the same galaxy pertain to a smaller scale of structure (the galaxy itself) and do not encompass the broader concept of galaxy clusters or superclusters.