ESC2000 Study Guide - Final Guide: Nicolaus Copernicus, Coronal Hole, Terrestrial Planet
Document Summary
Geocentric or ptolemaic model: earth centered, ptolemy 141 a. d, seven wanderers (planets) Emerged in the 16th and 17th century. Stated that the sun was in the middle. Tycho brahe (1546 to 1601: precise observer who catalogued over 700 stars over a period of 20 years. Sir isaac newton (1643 to 1727: law of universal gravitation. Earth center of universe (ptolemy) sun is the center (copernicus) milky way galaxy (galilei) lots of other galaxies (hubble) Starts with diffuse clouds of interstellar dust and gas (nebulae) Rotational motion: outward centrifugal force, gravity draws particles to the center of the rotating mass. Gravitational condensing of particles produces heat and pressure on the center. Hydrogen fusion: hydrogen (h) nuclei fuse, becomes helium (he) nuclei. Matter in the universe is mostly hydrogen (h) Energy produces heat, which expands (gas expansion) and acts to make the protostar larger. Outward pressure balanced by gravity pulling in.
