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Which of the following statements or expressions is most nearly associated with Kepler's First Law of Planetary Motion? (2 points)


P2 = A3
Planetary orbits are in the shape of an ellipse.
A planet moves fastest when it is farthest from the sun.
The distance to a planet is proportional to the time it takes the planet to complete an orbit.

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icedipping
Planetary orbits are in the shape of an ellipse.

Answer:

Option (1) and (2)

Explanation:

There are three laws of planetary motion.

1. Law of orbits: All the planets revolve around the sun in an elliptical orbit and sun is at one focus of the elliptical path.

2. Law of Areas: The planets sweeps out equal areas in equal interval of time,i.e., areal velocity remains constant.

3. Law of Period: The square of the time period of a planet is directly proportional to the cube of length of semi major axis.

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