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10 Cards in this Set
- Front
- Back
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Jeans instability
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The conditions of temperature, pressure, and density under which a star will form under the influence of its own gravitational attraction
Three reasons: 1) Winds from nearby stars compress gas and dust in the cloud 2) Explosive force of a nearby supernova can compress regions of gas and dust 3) Pairs of clouds collide and compress each other |
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Dense core
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Each collapsing fragment destined to become a star
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Solar nebula
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A dense core that has become Jeans unstable when its gas and dust was hit by the shock from a supernova
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Protosun
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The product of a concentration of matter at the center of a nebula
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Protoplanetary disks
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Disks of gas and dust surrounding young stars
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Accretion
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The coming together of smaller pieces of matter to form larger ones
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Kuiper belt
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Planetessimal belt orbiting Neptune
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Oort comet cloud
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Spherical distribution of debris
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Kuiper Belt Objects, KBOs
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Ice-rich comets with elongated orbits sometimes reaching closer to the Sun than the Earth
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trans-Neptunian objects, TNOs
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All the objects that orbit the Sun farther than Neptune
ex. Plutinos and plutoids |
