AST101H1 Lecture Notes - Lecture 15: Basalt, Planetary Science, Main Source

• School: UTSG
• Department: Astronomy & Astrophysics
• Course: AST101H1
• Professor: Bryan Gaensler

Document Summary

Hypothesis must explain: all things in solar system orbit in same direction, weird exceptions, most orbits are circular, terrestrial planets near sun; jovian planets farther out, many asteroid and comets. We should never see all the jovan planets orbiting in the outer regions and the terrestrial planets orbiting on the outside. Rotation of venus, uranus (something crashed into venus that made it spin the wrong way) Nebular hypothesis says there should be early bits in the solar system. The moon cannot have been captured by the earth, because it"s too big. The moon and the earth cannot have formed together, because their compositions are different. Best understanding on how moon was formed was a planet the sized of mars crashed into the earth. Leading theory: during the formation of the solar system, a mars-sized planet struck the. The moon formed out of the debris. Overall moon composition similar to earth"s outer layers.