In the seventeenth century, astronomer Johannes Kepler observed the planets revolving around our sun and analyzed data about them. He found that as the distance from the Sun increases, the amount of time it takes for the planet to go all the way around the Sun increases. Even though Kepler did not know why his observation was true, it has been found that planets in all solar systems always revolve around suns the same way.
Answer
A
It does not discuss independent and dependent variables that can be observed or tested.
B
It does not provide an explanation for why the relationship exists between distance and orbit time.
C
A lot of new technology has been developed that can record more accurate data about planetary motion.
D
A lot of different understandings of why planets move have been developed, and Kepler’s provides the best explanation.
Explanation
Kepler observed that planets farther from the Sun take longer to complete an orbit, but the passage says he did not know why this relationship exists. A scientific theory should explain why observed patterns occur, not only describe them. Therefore, the limitation is that Kepler’s observation does not explain the relationship between distance and orbit time.
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