BIOLOGY 1AL Chapter Notes - Chapter 1: Cosmic Microwave Background, Big Bang, Radiometric Dating
Document Summary
By talking about the history of the earth. By talking about the history of the solar system and galaxy. By talking about the origin of the universe. Recommended fun reading: a short history of nearly everything bill. Origin of the universe big bang, ~13. 8 bya. In 1929, hubble showed that all galaxies are moving apart, suggesting an expanding universe. In 1964, radio astronomers arno penzias and robert wilson discovered a microwave signal, cosmic. Microwave background that had been predicted by the big bang theory in which the universe expands from a singularity. Origin of the milky way ~ 13. 2 bya. Origin of the earth ~4. 5 bya (based on radiometric dating of earth rocks and meteorites) Origin of life on earth ~ 3. 8 bya. Some of the oldest evidence comes from fossilized stromatolites, formed by cyanobacteria, can be found in western australia. Thy are accretionary structures formed by microbial mats (biofilms) Origin of anatomically modern humans ~ 200,000 years ago (0. 2.
