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16 Cards in this Set
- Front
- Back
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chemical compositions
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what substances things are made of
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asteroid belt
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the region of the solar system between the orbits of Mars and Jupiter
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asteroids
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rocky objects
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minor planets
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another name for asteroids
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comets
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small objects, each a combination of rock and ice
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Oort cloud
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comets that form a spherical "halo" around the solar system
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meteoroids
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the result of collisions between asteroids, whose orbits sometimes cross.
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impact crater
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the result of an object colliding with the solid surface of a terrestrial planet or a satellite
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magnetometers
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devices that measure magnetic fields
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liquid metallic hydrogen
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highly compressed hydrogen deep inside Jupiter behaves like an electrically conducting metal
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nebular hypothesis
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the solar system formed from a cloud of interstellar material called the solar nebular . this occurred 4.56 billions years ago
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solar nebula composition
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98% hydrogen ad helium
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formation of terrestrial planets
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accretion of dust particles into planetesimals, then into larger protoplanets
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core accretion models
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four Jovian planets began as rocky protoplanetary cores
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alternative disk instability model
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Jovian planets formed directly from the gases of the solar nebula
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extrasolar planets
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-detected wobble of the stars around which they orbit
-discovered by the transit method - quite massive and have orbits that are different from planets in our solar system |
