# Astronomy

1. How did the geocentric model explain the retrograde motion of planets?
A. Earth moves faster in its orbit and passes the other planets.
B. The planets move backward when they get too close to earth.
C. The planets travel in circles as they move around earth in a circle.
D. Earth moves away from the planets, causing them to appear to move backwards.

4. Using Kepler's third law, how long does it take Saturn to orbit the sun given that its distance from the sun is 9.529 AU?
A. 4.45 years
B. 27 years
C. 29.4 years
D. 91 years

5. Ancient civilizations used astronomical objects to define time, including the number of days is a week. Why are there seven days in a week?
A. They could only see seven rings around Saturn.
B. Only seven objects changed position over time.
C. They could only see seven galaxies without using a telescope.
D. Only seven signs of the zodiac were indentified by ancient people.

6. Which of the following was the earliest solar system to exist?
A. Aristotelian
B. heliocentric
C. Copernican
D. Ptolemaic

8. By comparing the position of the sun and the shadows cast at noon on the summer solstice in two different cities, Eratosthenes was the first to determine,
A. The size of earth
B. The distance from earth to sun
C. The earth was round
D. The distance between the two cities

9. Kepler's three laws resulted from his careful analysis of _____ data, and we're not derived from a mathematical model.
A. Experimental
B. Hypothetical
C. Theoretical
D. Observational

10. How did ancient civilizations use a stick in the ground to find the direction north?
A. The shadow of the stick points north when the sun rises in the morning.
B. The shadow of the stick points north at approximately noon.
C. The shadow of the stick points north when the sun sets in the evening.
D. The shadow of the stick points north when the shadow is the longest.

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bobpursley
2. 1.b 2.c 3.a. 4.c. 5.b. 6.b. 7.b. 8.d. 9.a. 10.c 100%

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3. 1.) C
2.) B
3.) B
4.) B
5.) B
6.) D
7.) A
8.) A
9.) 29.4 years
10.) C

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4. Dylan's answers were actually correct... EXCEPT 9 was B; Eclipse (: SO 100% ANSWERS.
1. C
2. B
3. B
4. B
5. B
6. D
7. A
8. A
9. B
10. C

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___________________________

1) Which of the following did Galileo not observe through his telescope?

ANSWER: C - the rotation of the stars.

2) How did the geocentric model explain the retrograde motion of planets?

ANSWER: C - the planets travel in circles as the move around the Earth in a circle.

3) A(n) _____ describes the shape of a planet's orbital path.

4) How did ancient civilizations use a stick in the ground to find the direction north?

ANSWER: B - The shadow of the stick points north at approximately noon.

5) By comparing the position of the sun and the shadows cast at noon on the summer solstice in two different cities, Eratosthenes was the first to determine what?

ANSWER: A - the size of the Earth

6) Which of the following was the earliest solar system model to exist?

7) Using Kepler's third law, how long does it take Saturn to orbit the sun given that its distance from the sun in 9.529 AU?

8) What did Copernicus theorize was at the center of the universe?

9) Kepler's three laws resulted from his careful analysis of ____ data, and were not derived from a mathematical model.

10) Ancient civilizations used astronomical objects to define time, including the number of days in a week. Why are there seven days in a week?

ANSWER: B - Only seven objects changed position over time.

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