ASTR 151 1st Edition Lecture 9 Outline of Last LectureI. ReviewII. Chapter 6.1III. Chapter 6.2IV. Chapter 6.3V. Chapter 6.4Outline of Current LectureVI. Chapter 6.5VII. Chapter 6.6VIII. Chapter 6.7IX. SummaryCurrent LectureI. Chapt. 6.5 a. Interplanetary Matteri. “Cosmic debris” that can be about anything from asteroids, comets, meteoroids, down to dust. 1. Solar wind – stream of energetic charged particles that continually flows from the sun2. Asteroid – anything larger than 100meters in diameter3. Meteoroid – anything smaller than 100meters in diameter4. Comets – icy in composition and usually are 1 to 10 kilometers in diametersb. Kuiper belt is an outer lying asteroid belt II. Chapt. 6.6a. Nebular Contraction i. – Gas and dust slowly forms into starsb. Angular Momentumi. – Relates to Kepler`s 2nd Lawii. Measure of the amount of rotation an object has, taking into account it`s mass, shape, and speediii. Angular Momentum conserved (L) = r * mvThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.iv. Made by a French astronomer, Rene` Descartesv. Cloud and dust expands and contract due to angular momentum1. Nebula2. Nebula contracts and collapses3. Materials gather to form star and planets4. Condensation Theory - Process can`t work without interstellar dustc. Planetesimalsi. 100,000 year old objects that are smaller than small moonsii. Tauri stars are in an active phase and have strong solar windsIII. Chapt. 6.7a. Jovian and Planetary Debrii. Dust breaks into moleculesii. Dust left at the core radiates the heatiii. As the dust cools, the particles begin to reformb. Core Accretioni. The time it takes for a star to formc. Gravitational Instability Theoryi. Cool outer regions are unstable and may or may not collapse underit`s weightii. The outcome depends on the core`s state whether it is rough or fairly smoothiii. Some theorists think Jupiter and other larger planets were not madein our solar systemd. Solar system formation in order from first to last:i. Outer spaceii. Inneriii. Solar NebulaIV. Summarya. Planetary orbits lie almost in the same planeb. Out planets are usually gaseous and largec. Planetesinmals were ejected from the solar system and are new in the Kuiper belt and the Oort
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