GEOS 1004 Lecture Notes - Lecture 1: Nucleosynthesis, Formation And Evolution Of The Solar System, Edwin Hubble
8 Mar 2018
School
Department
Course
Professor
Document Summary
The universe as we know it evolved following the big bang: A sudden (cid:498)explosion(cid:499) from a single, infinitely dense point (cid:523)energy only, no atoms(cid:524) at the center of the universe; ~13. 7 b. y. ago. Big bang theory does not explain why the bang occurred, but was constructed to explain observed consequences. What observations: elemental abundancies/ big bang nucleosynthesis. After 3 minutes: hydrogens can fuse into helium atoms. By 5 minutes: process complete; first 5 elements exist (h2, he, li, be, bo) Look-up item i: define fusion; review the basic nature of atoms (p. 16-17). thermonuclear reaction in which nuclei of lightatoms join to form nuclei of heavier a toms, as thecombination of deuterium atoms to form heliumatoms. 30 august 2017: observed expansion; (cid:498)red shift(cid:499) 1920s, edwin hubble observed distant galaxies emit light that is shifted to red wavelength (lower frequency); none are shifted to blue.
