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Ninth Grade (Grade 9) Astronomy Questions

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Grade 9 Universe
A galaxy that is moving toward Earth will show                            .
  1. a decrease in brightness
  2. an increase in light years
  3. a blueshift in the spectrum
  4. a redshift in the spectrum
Grade 9 Planetary Motion
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
Grade 9 Universe
Grade 9 The Moon
Why does the Moon have different phases?
  1. It moves around the Earth and we see different areas of the Moon’s surface lit up.
  2. It moves around the Sun and reflects light from the Sun.
  3. The distance between the Moon and the Earth changes.
  4. It rotates on its axis from East to the West.
Grade 9 Space Exploration
Grade 9 Planetary Motion
Grade 9 Small Bodies and Dwarf Planets
How are comets formed?
  1. They were formed when the solar system was formed.
  2. The planets' gravity pull them in and they start orbiting the sun.
  3. They are smaller portions of meteorites.
  4. They are smaller portions of asteroids.
Grade 9 Outer Planets
The rings of the planet pictured below are mainly made of what?
Planet Saturn - Small
  1. water ice
  2. helium gas
  3. liquid hydrogen
  4. frozen carbon dioxide
Grade 9 The Moon
How does an equinox occur?
  1. When the Sun passes the equator from the Eastern to the Western.
  2. When the axis of the Earth is tilted at an angle of 24°.
  3. When the Moon is positioned exactly above the equator.
  4. When the position of the Sun is exactly over the equator.
Grade 9 The Moon
Grade 9 Planetary Motion
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.
Grade 9 Sun
What lies at the center of our solar system?
  1. the Sun
  2. Mars
  3. Earth
  4. the Moon
Grade 9 Universe
Grade 9 Inner Planets
When the solar system formed, which planets lost most of their gases to the Sun?
  1. the inner planets
  2. the comets
  3. the outer planets
  4. the asteroids
Grade 9 Outer Planets
A characteristic of the outer planets is                               .
  1. they have many moons and rings
  2. they have rocky surfaces
  3. they are small in size
  4. none of the above
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