GEG-1 Lecture Notes - Lecture 22: Natural Selection, Big Bang, Ultraviolet
Document Summary
Ultimate fate of universe galaxy clusters. which realeses energy making it hot. Some areas had more moss than others and gravity pulled these into masses called. One theory- expansion will continue forever, (one shot universe) Gravity pulls it all back into a teeny tiny ball to repeat process. Stars mostly hydrogen and helium plasma, so dense that a lot of fusion going on. Small stars (like our sun) eventually run out of energy and die. Big stars eventually collapse themselves, becommong so hot that fusion creates. Lightest elements initial stages of big bang. All others created during the explosions of massive stars. Around 4. 6 billion years ago interstellar dust began yo coalesce in a big rotating. Began of balls of gas, some cooled enough gas became solid, some energy left. Solar system spinning disk of interstellar dust. Continental crust lighter elements. the nuclei of most other atoms. Early solar system--- many collisions with small planets, asteroids, etc.
