GEOG 2050 Chapter : Key Concepts Ch 1
Document Summary
Milky way galaxy (oldest star ~13. 6 billion years, origin of universe formed about 13. 5-15 billion years ago (big bang theory) Formed ~ 6. 5 and 10 billion years ago. Speed of light = ~300,000 km/sec (186,000 miles/sec) Light year= ~ 10 trillion km (~6 trillion miles) Speed of light: gravity attractive force b/t mass objects, responsible for. Formation of solar system: orbits planets, moons orbit. Solar system formation begins to form from dust and gas ~4. 6 billion years ago: gravitational forces, heavier materials clump near center to form innermost proto-planets. Lighter materials coalesce near periphery to form outer planets: earth forms out of iron, nickel, manganese, and silicates. Sun large mass (~99. 9% of solar system: diameter 1,392,000 km (865,000 mi)~109 earths, ~74% hydrogen, ~25% helium, and less than 2% other, nuclear fusion of hydrogen atoms produce helium and releasing energy. Surface ~5770 k(9941 f), core ~28 million f. Insolation incoming solar radiation (suns radiance that enters top of earth"s atmosphere)
