For years, solar power at home was mostly limited to people who own their rooftops and could afford the steep upfront costs. But a new generation of small, affordable systems are making clean energy more accessible. The technology, often called "plug-in" solar, is already widespread in Germany and gaining momentum in the United States. KQED's Laura Klivans reports. | PBS NewsHour

Solar Nebula Theory & Patterns of Planetary Motion

What are the 6 stages of nebular theory? - TimesMojo

Formation of the Solar System: The Solar Nebular Theory - SlideServe