NATS 1740 Lecture Notes - Lecture 18: Primordial Black Hole, Alan Guth, Electronvolt

• School: York University
• Department: Natural Science
• Course: NATS 1740
• Professor: Radu Campeanu

Document Summary

Cosmogony the early biography of the universe (the archeology of the universe) V. slipher (1912) and e. hubble(1923) showed the most galaxies have the atomic spectra shifted towards red. 1929 - hubble and humason established that this shift increases with the galaxies becoming dimmer and dimmer. Hubble plotted galaxies speed vs distance and that plot bears his name. Galactic distances were calculated with cepheid stars measurements. The fact that all galaxies seems to move away from us does not imply that we are close to the place where the big bang occurred. We are in the middle of the expansion. Think about three galaxies moving with the speeds 1000, 2000 and 3000 km/s (we are moving with 2000 km/s. ) 1922 - a. friedman showed that einstein"s general relativity equations can have a solution corresponding to an expanding or contracting universe. 1926 - hubble"s diagram showed that all galaxies started from the same point.