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Look at slides summary of parts 1 3 why are there two

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Look at slides; summary of parts 1-3Why are there two major types of planets? Need to understand heating of the solar nebulaoAs the nebula contracts, gravitational potential energy is converted into kineticenergy (conservation of energy)The motion of atoms is accelerated by gravity as its atoms fall in israndomized via collisions, increasing thermal energy (becomes hotter) atexpense of gravitational potential energyAnother way to look at it is that gravity is compressing the nebula, andwhen you compress a gas it heats upoThe sun is formed at the center of the disk, since gas contracts toward the centerand density builds up thereoNebula became hottest in the center, where the sun is formed, because mostgravitational potential energy is released at smallest distances, due to gravitationalforce increasing as inverse square of distanceoSince the heating source (the sun) was in the center, the nebular disk was hotter inthe center and cooler in the outer parts far from the sunMain ingredients (composition of nebular also called interstellar) gasoHydrogen and helium gas, hydrogen compounds, rock, and metaloCondensation temperature and abundance are both relevant
Why are there two major types of planets? (The Frost Line)
How did the terrestrial planets form?
Accretion of Planetesimals
Why did the Jovian planets get so big?
How did the Jovian moons form?
Asteroids and comets: leftovers from accretionoRocky planetesimals formed inside frost lineMost collected into terrestrial planetsBut closer to Jupiter, Jupiter’s gravity stirs things up, keepingplanetesimals from collecting into a planetThese are the asteroids, mostly found in the asteroid beltIcy planetesimals from outside frost lineMost accreted and became Jovian planetsBut some were scattered into the inner solar system, colliding withsun or terrestrial planetsAnd some were ejected into the Oort Cloud (comets)Details: Heavy bombardmentoLeftover planetesimals (asteroids and comets) bombarded planets in the latestages of solar system formation, with many consequencesDetails: Origin of Earth’s wateroWater probably came to Earth after its formation by way of icy planetesimals(comets) during bombardment periodCaptured moonsoLecture slides
2/27: The Age of the Solar SystemElementso

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Term
Fall
Professor
alber, Dave
Tags
Solar System, Planet

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