# Flashcards - Praxis Middle School Science: Laws of Gravitation

Flashcards - Praxis Middle School Science: Laws of Gravitation
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Johannes Kepler
Johannes Kepler was a German mathematician, astronomer, and astrologer
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ellipse
In mathematics, an ellipse is a curve in a plane surrounding two focal points such that the sum of the distances to the two focal points is constant for every point on the curve
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ellipse
In mathematics, an ellipse is a curve in a plane surrounding two focal points such that the sum of the distances to the two focal points is constant for every point on the curve
Johannes Kepler
Johannes Kepler was a German mathematician, astronomer, and astrologer
orbital period
The orbital period is the time taken for a given object to make one complete orbit around another object
time period
Frequency is the number of occurrences of a repeating event per unit time

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