Why might the classification of a galaxy be subjective?

The classification of a galaxy can indeed be subjective primarily because it relies on human perception and the criteria established by astronomers for categorizing different types of galaxies. These criteria often involve characteristics such as shape, size, and the arrangement of stars, gas, and dust within the galaxy. Different astronomers may have varying interpretations of these characteristics, leading to different classifications for the same galaxy. For example, one observer might classify a galaxy based on its spiral arms, while another might focus on its color or brightness.

Additionally, the classification systems have evolved over time, influenced by the standards set by leading astronomers and the advancements in observational technology. As a result, the subjective nature of how we define and categorize galaxies can lead to discrepancies in the classification process, underscoring the role of human judgment in the field of astronomy.