Hydropower vs. Solar Power: Understanding Renewable Energy | LaDonna Mask | Read, Write, ROAR! Clip: S1 Ep1017 | 6m 54s | Use a Venn Diagram to compare hydropower and solar power. (6m 54s) ...

In the early centuries of astronomy, however, our visions of the cosmos often took the shape of diagrams—representing what we believed about our solar system.