Observational Bias: the History of Human Understanding of the Structure

Essay

Observational Bias: The history of human understanding of the structure of the Milky Way starts with the bias that humans use visible light to see. Imagine you were a creature on another planet in the disk of the Milky Way who used radio waves to "see" the universe. What would have been your starting point for the structure of the Milky Way? What components would you have found easier to detect? What components would have been harder?