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Planetary Motion (Grade 9)

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Planetary Motion

One complete revolution of Earth around the sun is called a
  1. day.
  2. night.
  3. month.
  4. year.
Earth is kept in orbit around the sun by
  1. its speed and distance from the sun.
  2. inertia and gravity.
  3. its shape and size.
  4. electricity and magnetism.
Planets that are close to the sun
  1. move through the asteroid belt
  2. orbit faster than the outer planets
  3. orbit slower than the outer planets
  4. move closer and closer to the sun
What is the shape of a planet's orbit?
  1. circular
  2. irregular
  3. elliptical
The point in orbit where the planet is far away from the sun is called
  1. aphelion
  2. precession
  3. perihelion
  4. rotation
Using Brahe's precise observations,                 discovered three laws of planetary motion.
  1. Aristotle
  2. Kepler
  3. Hipparchus
  4. Copernicus
What do changes in the Earth's orbit affect?
  1. Earth's shape
  2. Earth's temperatures
  3. Earth's rotation
  4. Earth's tilt
What causes the apparent movement of the sun across the sky during the day on Earth?
  1. revolution of Earth in its orbit
  2. rotation of Earth on its axis
  3. location of Earth in space
  4. objects are moving around Earth
Eccentricity refers to
  1. the wobble of the Earth as it spins
  2. the shift in the direction of the axis spin
  3. the cycles of ice ages and warming periods
  4. the elliptical shape of the Earth's orbit
A very slow directional shift of the Earth's axis that requires 26,000 years to complete is called
  1. precession
  2. retrograde motion
  3. occultation
  4. perturbation
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