Lesson 9.3 The Solar System Answers
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21
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Why was it difficult for people to accept a heliocentric concept of the solar system?
A
Scientists had no way to explain retrograde motion.B
Scientists did not check or confirm other scientists’ ideas.C
Information was published in Italian and people could not understand it.D
Aristotle was famous and his ideas were supported by religious teachings.22
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Which idea did Ptolemy’s model use to explain why the planets appeared to move backward as they moved in their orbits?
A
The planets spun in epicycles.B
The planets rotated on their axes.C
The planets revolved around the Sun.D
The planets were made of different materials.
24
Which idea was supported by Aristarchus, Copernicus, and Galileo?
A
The planets have epicycles.B
The planets revolve around the Sun.C
The stars rotate around the Sun.D
The center of the solar system is Earth.25
Which correctly lists three scientists who supported the heliocentric model of the solar system?
A
Aristotle, Ptolemy, CopernicusB
Copernicus, Ptolemy, KeplerC
Galileo, Kepler, AristotleD
Kepler, Galileo, Copernicus26
In addition to proposing that planetary orbits are elliptical, what other modification did Kepler make to Copernicus’s model?
A
Planets closer to the Sun move faster.B
Planets spin in an epicycle while orbiting Earth.C
Venus has phases due to its orbiting of the Sun.D
Earth’s rotation causes the rising and setting of the Sun.Did you find these answers helpful?
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