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Ch15 SS Formation P1

Vocabulary

TermDefinition
Planet major body that primarily orbits a star
Moon small body that primarily orbits something other than a star
Differentiation variation in the composition/density of an object
Nebular Theory original SS model where a large gas cloud contracted under its own gravity to form the Sun & planets
Condensation Theory builds on the nebular theory with interstellar dust grains that act as condensation nuclei
Conservation of Angular Momentum law explaining how an object spins faster as it contracts
Axial Tilt rotation angle of an object relative to the ecliptic
Ecliptic orbital plane of the planets, most asteroids, and Kuiper Belt Objects about the Sun
Retrograde Rotation backward, clockwise spin of a body
Resonance when two characteristic times are related in some simple way
Interstellar Cloud large cloud of gas found in the space among stars
Solar Nebula swirling gas cloud surrounding the early Sun during the solar system's formation
Condensation Nuclei dust grains in the interstellar medium that caused matter to clump together
Planetesimal object in the early solar system that had reached the size of a small moon
Accretion Disk rotating disk of matter formed by accretion around a massive body under the influence of gravity
T Tauri Star protostar in the late stages of formation exhibiting strong solar winds
Solar Wind outward flow of fast-moving charged particles from the Sun
Protoplanet planet forerunner that is formed in the early stages of solar system formation
Core-Accretion Theory says the Jovians formed when icy protoplanetary cores became massive enough to capture gas
Gravitational Instability Theory says the Jovians formed directly from the solar nebula via instabilities in the gas
Created by: john_bailey720
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