Which class is the base class for the hierarchy mentioned in the statement?

The base class in a hierarchy typically serves as the foundational element from which other classes inherit. In this case, if "Universe" is identified as the base class, it suggests that it represents the broadest or most general concept in the hierarchy, encompassing all other entities like galaxies, solar systems, and planets.

By design, the "Universe" would provide common attributes and methods that apply to all subclasses, which could include properties such as the number of galaxies, total mass, and other universal characteristics. Each derived class, such as "Galaxy," "SolarSystem," and "Planet," would then inherit from "Universe," allowing them to share these attributes while also implementing their specific additional features or properties.

This hierarchical structuring facilitates code reuse, reduces redundancy, and maintains a clear organization of entities within the realm of space. Thus, "Universe" being the base class sets a framework that can accommodate various celestial bodies and systems defined as subclasses, making it a logical choice in the context of this hierarchy.