Which of These Was a Contribution of Newton to Astronomy

question 47

Multiple Choice

Which of these was a contribution of Newton to astronomy?

• A)Artificial satellites could be put into orbit about the Earth.
• B)The Sun's gravity is greatest on a planet at perihelion, so the planet must speed up.
• C)The Moon pulls as strongly on us as we do on it.
• D)His differential calculus lets us calculate planetary motions more accurately.
• E)All of these were due to Newton's work.

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