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SAT® Subject Test in Physics

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Planet around Star

SATPHY-LFCT91

The picture below represents a planet (blue) orbiting a star. This particular planet has a highly elliptical orbit, as shown.

At what point in the orbit is the planet moving fastest?

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A

1

B

2

C

3

D

4

E

We cannot determine where the planet is moving fastest, since Kepler's Laws apply only to planets in our solar system.