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Third law: The square of the orbital period is proportional to the cube of the orbit’ssemimajor axis. That is, a3= kT2 where k is a constant.

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Third law: The square of the orbital period is proportional to the cube of the orbit’ssemimajor axis. That is, a3= kT2 where k is a constant.

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Second law: An imaginary line from the sun to a planet sweeps outequal areas in equal times. (This law relates the speed of a planet toits distance from the sun.)

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Second law: An imaginary line from the sun to a planet sweeps outequal areas in equal times. (This law relates the speed of a planet toits distance from the sun.)

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These orbits have been put in order based on the shape. Think about putting them in order of the distance of the sun from the center point of the orbit. Mark the orbits that would change positions, or draw a check mark if the order would not change.

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first law: each planet orbits the sun in an ellipse with the sun at one side.

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first law: each planet orbits the sun in an ellipse with the sun at one side.

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the time to complete one orbit is the planet's T.

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the time to complete one orbit is the planet's T.

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an ellipse equals the distance between the center and focus over length of semimajor axis.

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an ellipse equals the distance between the center and focus over length of semimajor axis.

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The square of the orbital period is proportioned to the cube of the semimajor axis.

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The square of the orbital period is proportioned to the cube of the semimajor axis.

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Planetary orbits differ from nearly circular to elongated and skinny,

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Planetary orbits differ from nearly circular to elongated and skinny,

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Laws describing planetary motion = 1st law) Each planet orbits the sun in an eclipse with the sun @ one focus, 2nd law) imaginary line from the sun to a planet sweeps out equal areas and equal times, 3rd law) The square of the orbital period is proportional to the cube of the orbit’s semimajor axis, which means a^3=kT where k=constant. 

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Laws describing planetary motion = 1st law) Each planet orbits the sun in an eclipse with the sun @ one focus, 2nd law) imaginary line from the sun to a planet sweeps out equal areas and equal times, 3rd law) The square of the orbital period is proportional to the cube of the orbit’s semimajor axis, which means a^3=kT where k=constant. 

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Whats the difference between kinetic energy and potential energy? 

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Whats the difference between kinetic energy and potential energy? 

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In a planetary orbit, the length of the semimajor axis is the average of the planet's greatest and least distance from the sun

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In a planetary orbit, the length of the semimajor axis is the average of the planet's greatest and least distance from the sun

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The relationship can be stated as T square times a cube, also known as Kelper's third law.

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The relationship can be stated as T square times a cube, also known as Kelper's third law.

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Distance is given in astronomical units (AU) which is Earth's average distance from the sun. 

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Distance is given in astronomical units (AU) which is Earth's average distance from the sun. 

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Every planet has a different orbit around the sun.

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Every planet has a different orbit around the sun.

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Its kinetic energy (KE) increases and decreases with its speed.

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Its kinetic energy (KE) increases and decreases with its speed.

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The length of the semimajor axis gives the planet's average distance from the sun.

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The length of the semimajor axis gives the planet's average distance from the sun.

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As an object moves away from the sun, its speed decreases. 

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As an object moves away from the sun, its speed decreases. 

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The focus distance relative to the size of the ellipse gives the eccentricity: e= c/a = distance between center and focus/ length of semimajor axis

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The eccentricity of an ellipse, e, is a measure of its elongation—how much it deviates from a circle

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An orbit and the sun lie in a plane called the orbital plane

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elongated means a long in relation to width, especially unusually so

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elongated means a long in relation to width, especially unusually so

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distance from one focus to any point on the ellipse and then to the other focus is constant.

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The motion of planets in space is observable, even from a great distance.

An orbit and the sun lie in a plane called the orbital plane.

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As an object in orbit moves closer to the sun, its speed increases

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Ellipse- a closed curve defined by two points called foci.

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Motion of planets in space are observable

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The planets have elliptical orbits that are nearly circular.