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Kepler cracks the puzzle of changing orbital speed using one planet whose orbit strays furthest from a circle. That planet was:
APluto
BMars
CVenus
DEarth
Answer & Solution
Correct answer: B. Mars
1. Its orbit is noticeably non-circular.
2. Brahe's records of it were the richest.
3. It was Mars.
_Source: OpenStax Astronomy 2e, Chapter 3, Orbits and Gravity._
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