ENV100Y5 Lecture Notes - Lecture 5: Nebular Hypothesis, Stellar Evolution, Gravitational Collapse

• School: UTM
• Department: Environment
• Course: ENV100Y5
• Professor: Barbara Murck

Document Summary

Age of sun and solar system = ~ 4. 57 ga (billions of years) Based on models of stellar evolution and dating of primitive solar system objects. Based on ages of terrestial rocks + age of solar system + models of solar system formation. The nebular hypothesis also known as nebular theory of solar nebula model explains the origin of the solar system. Interstellar cloud inherits elements from previous generations of stars. Rotates and ends up in a shape of flattened disc. High pressure and temperature creates nuclear fusion in the sun: solar nebula. Accretion of objects (becomes a larger object) Differentiation (segregates causing higher density to sink and lower density to rise therefore, it separates from one part to another) The crust we live on has a lower density because the nucleus sank and the crust rose when the planet was formed. P. s: the rest of chapter two will be covered in the next lecture.