PHYSICS 20B Lecture Notes - Lecture 1: Johann Gottfried Galle, Relative Direction
Document Summary
Cosmology is the study of the origin and evolution of the universe, all of time and space. This course will discuss questions both profound and mysterious: Much of this course follows the historical quest to understand our place in the universe, and discusses key figures including: aristotle, ptolemy , newton , einstein , and leavitt . Homework q&a(review): the closer a planet, asteroid, or comet is to the sun in its orbit, the faster it moves. Explain qualitatively how this comes about as a consequence of kepler"s law of equal. Areas: kepler"s law of equal areas states that a planet orbiting the sun will sweep out the same area in the orbital plane every day (or in any fixed unit of time). For a fixed distance around the arc, the area that an arc sweeps out is smaller if the radius of the arc is smaller.
