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Planetary Motion (Grade 9)

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Planetary Motion

1. 
One complete revolution of Earth around the Sun is called a
  1. day.
  2. night.
  3. month.
  4. year.
2. 
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.
3. 
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.
4. 
What is the shape of a planet's orbit?
  1. circular
  2. irregular
  3. elliptical
5. 
The point in orbit where the planet is furthest away from the Sun is called
  1. aphelion.
  2. precession.
  3. perihelion.
  4. rotation.
6. 
Using Brahe's precise observations,                 discovered three laws of planetary motion.
  1. Aristotle
  2. Kepler
  3. Hipparchus
  4. Copernicus
7. 
What do changes in Earth's orbit affect most greatly?
  1. Earth's shape
  2. Earth's temperatures
  3. Earth's rotation
  4. Earth's tilt
8. 
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
9. 
Eccentricity refers to
  1. the wobble of 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 Earth's orbit.
10. 
A very slow directional shift of 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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