NATS 1740 Lecture Notes - Lecture 14: Cambrian Explosion, Allan Hills 84001, Methane

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

Document Summary

Describe the conditions for a stellar black hole to be formed. Describe the tidal effects and time dilation near a black hole. Describe the x-ray observations of a black hole. Astrobiology: interdisciplinary research field on exobiology, the study of planets in the solar system and beyond, space flights, origins of life. Exobiology: the study of organisms that originate outside earth. Age of earth is 4. 56 billion years determined from radiometric age-dating (based on radioactive isotopes studies) Age of the universe is 13. 7 billion years determined from the latest galactic studies (based on the hubble diagram) Chemical evolution - the process that manufactured molecules and compounds of increasing complexity. Supernovas produced heavy atoms, which were combined to form molecules and compounds, which were subsequently condensed into asteroids, planets and new stars. Recent astrophysical experiments demonstrated the fact that asteroids can contain complex aromatic molecules, which could lead to life under certain physical conditions (the miller-urey experiment)