AS101 Chapter Notes - Chapter 1: Big Bang, Cosmic Calendar
Document Summary
1. 1 from solar system to galaxy to universe. Earth rotates w to e and crosses the sunset line which means the sun has set. Moon is 1/4 the size of earth and orbits around the earth. Light reaches in 8 mins from sun to earth. Not possible to see any distance larger than 13. 8 billion light years. The start nearest to the sun is centuari (proxima) Light takes 4. 5 years form centauri to get to earth. Clouds give birth to stars (galaxy has billions of them) Ex: a cloud gave birth to the sun billions of years ago. Gases of stars generates energy by nuclear fusion. Spiral arms extend from the centre to the edge. Local group: clusters of galaxies with ours included. Clusters of clusters= superclusters, they link together to form filaments that outli w. Filaments are the largest structure in the universe. Super voids: huge voids that have no galaxies.
