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22 Cards in this Set
- Front
- Back
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What are the nine largest bodies orbiting the sun?
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planets
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What shape is like a flattened circle? This is the shape of the orbits of the planets.
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ellipse
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What is one of the two points used to define an ellipse?
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focus
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What is the term for the point in a planet's orbit when it is NEAREST the sun?
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perihelion
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What is the term for the point in a planet's orbit when it is FARTHEST from the sun?
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aphelion
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What is the average distance between Earth and the sun called? It is about 150 million km.
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astronomical unit (ua)
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What is the measure of a planet's ability to reflect light called?
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albedo
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What is the measure of the amount of matter an object contains?
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mass
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What is the force of gravity exerted on an object?
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weight
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What is the downward pull the planet exerts on objects at its surface? It is determined by a planet's size and its mass.
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surface gravity
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What is a planet called that is closer to the sun than the earth?
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inferior planet
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What is the appearance of the moon according to the amount of the lighted side that is visible from Earth?
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phase
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What is it called when a planet passes directly between the earth and the sun so that we see its dark silhouette against the sun's bright disk?
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transit
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What is a planet called that is more distant from the sun the the earth?
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superior planet
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As the earth passes a superior planet, the superior planet appears to move backward compared to the background stars. What is this called?
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retrograde motion
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What are planets called that are the earth's size or smaller and have about the same density as the earth? These include Mercury, Venus, Earth & Mars.
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terrestrial planet
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What kind of planet has a deep, dense, gaseous atmosphere, low overall density, and probably little or no solid core?
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Jovian
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What are planets called that are mostly gaseous? They have little free oxygen and very likely no liquid water.
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gas giant
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What is another name for the four largest moons of Jupiter?
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Galilean moons
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On Jupiter, what is the name for the reddish-colored, rotating, oval-shaped area?
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Great Red Spot
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What is the name for the area of Saturn's rings that appears to be empty?
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Cassini's Division
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The eclipsing of a planet by the moon or another planet.
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occult
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