GEOG 1001 Chapter : Geography
Document Summary
Key concepts: milkway, solar system, speed of light, gravity, solar system formation, inner planets, sun, isolation, solar radiation, evolution of the atmosphere, solar radiation, fusion, solar wind. Origin of the universe: formed 13. 5-15 billion years ago, milky way galaxy, oldest star-13. 6 billion years, disk formed between 6. 5 to 10. 1 billion years ago, speed of light- 300,000 km/sec, light year- 10 trillion km (6 trillion miles) Gravity: attractive force between objects with mass, responsible for: formation of solar systems, orbits of planets, moon"s orbit,tides. Sun"s radiation: disrupts radio broadcasts and overloads electrical systems, light- electromagnetic radiation ( 8 minutes to reach earth, solar wind, a stream of electrically charged particles ejected from the sun, 17 hours to 7 days to reach earth. Equinox: equal days and equal nights, subsolar point on equator at the equinox, march 20,21 spring (fall) in the n. (s. ) hemisphere, september 22,23 in the n. (s. ) hemisphere.
