What made it possible for scientists to practice direct observation?

Direct observation became possible for scientists due to advancements in technology and methodology, such as the development of microscopes and telescopes that allowed for the examination of both microscopic and astronomical phenomena. The scientific method also encouraged systematic observation, experimentation, and documentation, enabling researchers to gather empirical data. Additionally, a shift towards a more empirical and skeptical approach to knowledge during the Renaissance and Enlightenment periods fostered an environment where direct observation was valued as a reliable source of information.