ENV100Y5 Lecture Notes - Lecture 5: Acasta Gneiss, Formation And Evolution Of The Solar System, Nuclear Fusion

• School: UTM
• Department: Environment
• Course: ENV100Y5
• Professor: Monika Havelka

Document Summary

Env session 5: earth as a planet (18-9-15) Age of sun and solar system approx. 4. 57 ga (giga annum: based on models of stellar evolution and dating of primitive solar system objects. Gneiss) formation: based on ages of terrestrial rocks and age of solar system, oldest rock we have found is approx. 4 ga old (acasta: no rocks older than this found on earth. The nebular hypothesis* (or nebular theory or solar nebula. Model) explains the origin of the solar system: interstellar cloud inherits elements from previous generation of stars. The solar nebula: (high temperature and pressure in middle, low temperature and pressure outside: if the temperature and pressure in the middle part is high enough, nuclear fusion begins (a star is born, ex our sun) Outer edge: colder: accretion of objects, differentiation (separating one part from another part) area)