HISTORY 2720 Lecture Notes - Lecture 7: Exoplanet, Solar Wind, Radial Velocity
26 Mar 2018
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Document Summary
Molecules in space couldn"t do much unless surrounding stars. Our solar systems started with a flattening disk that led to fusion. 99% of the matter is the sun, the 1% is the rest of the solar system. Outer gassy planets contain 99% of the rest of the material. Accretion: material gathers together through collisions and materials orbiting then forming together. 4th threshold: formation of earth and solar system. Universe is getting more complex, diverse, and intersting. Originally proposed by immanuel kant and pierre-simon de laplace two centuries ago. Interstellar gas and dust gathers and collapses under its own gravity. As it collapses, it gathers angular momentum, spins faster and flattens out. Planets gather in orbiting disk of dust (protoplanetary disk) around large central sun. Hard to see how else the sun could have captured planets. Or why all the planets orbit in the same direction and same plane. Captured objects would orbit in different planes and direction.
