Is scientific explanations are always based on empirical evidence?

Yes, scientific explanations are fundamentally based on empirical evidence, which is derived from observations, experiments, and data collection. This reliance on empirical evidence ensures that scientific claims are testable and falsifiable, distinguishing them from beliefs or opinions. While theories may evolve over time, they remain grounded in observable phenomena that can be measured and verified. Thus, the scientific method prioritizes evidence as the foundation for understanding the natural world.