ASTA01H3 Lecture Notes - Observable Universe, Milky Way, Cosmic Calendar
Document Summary
Asta01-chapter 1: the scale of the cosmos: space and time. 1. 1 from solar system to galaxy to universe. Lecture 01: astronomy is more than the study of planets, stars and galaxies. Study of the the whole universe in which you live: humanity is confined to a small planet circling an average star, no edge or an end in space of universe, universe may be infinite. May extend in all directions without limit. 90 years ago: astronomers found that the universe expands. 13 years ago: astronomers found that it is expanding at an accelerating pace. It is the home of the large hadron collider. The largest particle accelerator in operation today, which was designed to simulate the beginning of the universe. Physicists study collision of objects on the scale. = 1 fm (femtometer or fermi: we start using either prefixes (e. g. , kilo, which means one thousand ) or scientific notation (i. e. , using powers of 10).
