Planetary Motion

What shape is Earth's orbit?

• circle

• ellipse

• square

• spiral

What is Kepler's 1st law?

• The planets orbit in an ellipse

• The plants move faster when they are closer to the sun and slower when they are further from the sun

• The farther a planet is from the sun the slower the orbit

  (P² = a³)

What is Kepler's 2nd law?

• The planets orbit in an ellipse

• The plants move faster when they are closer to the sun and slower when they are further from the sun

• The farther a planet is from the sun the slower the orbit

  (P² = a³)

What is Kepler's 3rd law?

• The planets orbit in an ellipse

• The plants move faster when they are closer to the sun and slower when they are further from the sun

• The farther a planet is from the sun the slower the orbit

  (P² = a³)

The center of mass between two objects. This is what the planets truly orbit.

• barycenter

• precession

• nutation

• ellipse

Earth's wobble cause by the gravitational pull from the Sun & Moon. This changes the direction of the Earth's axis and will cause the north star to change over time.

• barycenter

• precession

• nutation

• ellipse

Earth's wobble cause by the gravitational pull from the Moon only. This changes the degree of the Earth's tilt and will cause seasonal changes.

• barycenter

• precession

• nutation

• ellipse

Due the the solar system's changing barycenter, the Sun is NOT stationary.

• true

• false

During the origin of our solar system the planets began to orbit the Sun because it was the least dense object.

• true

• false

The point in the earth's orbit where it is closest to the sun and moves the fastest.

• aphelion/apogee

• perihelion/perigee