ASTRO 142 Lecture Notes - Lecture 10: Big Bang, Escape Velocity, Standard Gravity
Document Summary
Astro 142: from the big bang to the milky way. Chapter 11, entitled modeling the universe was about just that - di erent possible models for the universe. The chapter begins by explaining the similarities between a newtonian universe and einstein"s model of the universe. Acknowledging the aws in newton"s original thoughts of the universe (i. e. that it is in nite and unchanging), the textbook tries to explain the bene ts of his model. Newtonian universe would consist of some sphere where the surface of the universe experiences a gravitational attraction which decelerates the expansion of the universe. In this model, the expan- sion must have came originated with some initial outward velocity. The textbook then goes into an overly-lengthy discussion regarding how escape velocity relates to the expansion of the universe in terms of overcoming gravity in any circumstance. From this, the textbook explains the concept of what it calls, e .
