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| the distance from Earth to the Sun |
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| mercury, venus, earth and mars |
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| most likely found on Jupiter |
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| was named after the mythical Roman messenger of speed |
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| a day on this planet is longer than a year on another |
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| callisto, europa, ganymee and Io |
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| 25 percent that of the density of earth |
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| the only moon in the solar system with substantial atmosphere |
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| composed of thousands of particles of various sizes |
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| planet with the lowest average density, which is less than that of liquid water |
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| area of the solar system where long-period comets originate |
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| have orbital periods less than 200 yrs |
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| remnants of comets and asteroids found in space |
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| most widely accepted theory on the origin of the solar system |
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| planet comprised of hydrogen, helium and methane and have a density of less than 2 g/cm |
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| still has its own atmosphere |
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| venus appears the brightest |
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| small body with a composition and structure closest to the materials that condensed from the accretion disk |
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| a small body from space that falls on the surface of earth |
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| separates the terrestrial planets from the giant planets |
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| called the morning star and the evening star depending on its position with the sun |
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| it is covered with clouds that reflect light |
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| a high pressure region with high cold clouds |
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