Remember Kepler's Third Law, Which Relates the Period of Revolution

question 42

Multiple Choice

Remember Kepler's third law, which relates the period of revolution to the average distance to a planet.   How do we modify that law to use with binary stars?

• A) Add the total mass of the two stars.
• B) Add Newton's law of gravitation.
• C) Add Einstein's law of relativity.
• D) Add the difference of their masses.
• E) Add the distance between the two stars.

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