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22 Cards in this Set

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