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the largest terrestrial and jovian planets are respectively |
Earth and Jupiter |
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Which planets have had volcanic activity at some point in their histories |
all of them |
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large moons orbit their planets in the same direction the planets rotate |
most of the time |
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which of the following three kinds of objects resides closer to the sun on average |
asteroids |
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whats unusual about our moon |
It’s not the largest moon, but it’s surprisingly large relative to the planet it orbits |
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planetary orbits are |
fairly circular and in the same plane |
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which have more moons on average |
jovian planets |
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the most abundant ingredient of the sun and jupiter is |
Hydrogen |
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are there any exceptions to the rule that planets rotate with small axis tilts and in the same direction that they orbit the sun |
Venus, Uranus, and Pluto are exceptions |
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the cassini spacecraft |
is orbiting saturn |
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flyby |
a spacecraft on a flyby goes past a world just once and then continues on its way |
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orbiter |
a spacecraft that orbits the world it is studying allowing longer term study |
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lander or probe |
these spacecrafts are designed to land on a planets surface or probe a planets atmosphere by flying through it. some landers carry rovers to explore wider regions |
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sample return mission |
a sample return mission requires a spacecraft designed to return to earth carrying a sample of the world it has studied |
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patterns of motion among large bodies |
*all planetary orbits are nearly circular and lie nearly in the same plane *all planets orbit the sun in the same direction: counterclockwise as viewed from the north pole *most planets rotate in the same direction in which they orbit with fairly small axis tilts. the sun also rotates in this same direction *most of the solar systems large moons exhibit similar properties in their orbits around their planets ex)orbiting in their planets equatorial plane in the same direction that the planet rotates |
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terrestrial planets |
*mercury,venus,earth,mars *smaller size and mass *higher density *solid surface *few if any moons and no rings *closer to the sun and closer together with warmer surfaces |
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jovian planets |
*jupiter saturn uranus neptune *larger size and mass *lower density *made mostly of hydrogen helium and hydrogen compounds *no solid surface *rings and many moons *farther from the sun and farther apart,with cool temperatures at cloud tops |
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hydrogen compounds |
compounds containg hydrogen such as water h2o ammonia nh3 and methane ch4 |
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