Astronomy college course/Apparent regrograde motion/Quiz01/Original version of this quiz

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1 ____ motion is in the usual direction, and _______ is motion that has temporarily reversed itself.

	direct; elliptical
	elliptical; retrograde
	direct; retrograde
	indirect; direct
	retrograde; direct

2 Under what conditions would a planet not seem to rise in the east and set in the west?

	if the planet is in retrograde motion
	if the observer is near the north or south poles
	if the planet is in direct motion
	if the planet is in elliptical motion
	if the observer is below the equator

3 When the faster moving Earth overtakes a slower planet outside Earth's orbit

	retrograde motion occurs
	two of these are true
	all of these are true
	tidal forces can be observed on Earth
	tidal forces can be observed on the planet

4 Which planet spends more days in a given retrograde?

	Saturn
	It depends on the season
	They are all equal
	Earth
	Mars

5 Which planet has more days between two consecutive retrogrades?

	Earth
	Mars
	It depends on the season
	They are all equal
	Saturn

6 A planet that is very, very far from the Sun would be in retrograde for approximately ___ months.

	1
	6
	24
	12
	3

7 If a planet that is very, very far from the Sun begins a retrograde, how many months must pass before it begins the next retrograde?

	12
	1
	24
	6
	3

8 Planet comes from the Greek word for 'wanderer'.

	true
	false

9 We know that Galileo saw Neptune, but is not credited with its discovery because

	he never published his drawing
	none of these are true
	he thought it was a moon of Saturn
	it was in a transition between retrograde and direct motion
	it was too faint to be worth drawing