a planet is in an ellipitical orbit about a star. Which of the following is true

Question

a planet is in an ellipitical orbit about a star. Which of the following is true?

1. The star is at a focus of the ellipse. The planet moves faster near the stars then away from the star. The period depends on the mass of the planet.

2. The star is at a focus of the ellipse. The planet moves slower near the star then away from the star. The period does not depend on the mass of the star

3. The star is at a focus of the ellipse. The planet moves faster near the star than away from the star. The period does not depend on the mass off the planet.

4. The star is at the center of the ellipse. The planet moves faster near the star then away from the star. The period does not depend on the mass of the planet.

5. The star is at the center of the ellipse. The planet moves slower near the star than away from the star. The period depends on the mass of the planet.

6. The star is at the center of the ellipse. The planet moves faster near the sstar then away from the star. The period depends on the mass of the planet

Explanation / Answer

according to kepler's law

4. The star is at the center of the ellipse. The planet moves faster near the star then away from the star. The period does not depend on the mass of the planet.

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