• 1. 
    The apparent brightness of a star

  • varies with the position from which it is viewed.
  • can be calculated from its absolute brightness and mass.
  • is greater as distance from the sun increases.
  • is a measure of its light viewed from any position.
  • 2. 
    The parallax of a star is observed because

  • all stars have the same apparent brightness.
  • parallax increases with distance.
  • stars do not move.
  • the observer moves.
  • 3. 
    In a diagram depicting the solar system as heliocentric, what is located at the center?

  • Earth
  • the sun
  • the moon
  • Mars
  • 4. 
    Study Figure 25-1. Suppose you are an astronaut on the side of the moon facing Earth during a total lunar eclipse. Which would you see as you look toward Earth?

  • Earth illuminated by reflected moonlight.
  • The normal view; there is always reflected light from the moon’s surface.
  • You could not see the sun because Earth blocks its light.
  • The light from the sun behind Earth would be blinding.
  • 5. 
    Which of the following provides support for the big bang theory?

  • red shift
  • cosmic microwave background radiation
  • elliptical galaxies
  • both red shift and cosmic microwave radiation
  • 6. 
    What will happen to the relative amounts of hydrogen and helium in the sun over the next few billion years?

  • Hydrogen will increase and helium will decrease.
  • Hydrogen will decrease and helium will increase.
  • Both hydrogen and helium will decrease.
  • Both hydrogen and helium will remain the same.
  • 7. 
    The distance between stars is typically measured in

  • light-years
  • liometers
  • astronomical units
  • miles
  • 8. 
    The big bang theory explains the

  • origin of the universe.
  • life cycle of a star.
  • Doppler effect.
  • arrangement of constellations.
  • 9. 
    The orbit of a planet around the sun is a(an)

  • ellipse.
  • straight line.
  • circle.
  • parabola.
  • 10. 
    Which of the following helps explain why the planets remain in motion around the sun?

  • density
  • gravity
  • inertia
  • Both gravity and inertia
  • 11. 
    The gravitational force between two objects increases as mass

  • decreases or distance decreases.
  • decreases or distance increases.
  • increases or distance decreases.
  • increases or distance increases.
  • 12. 
    Which of the following objects does NOT orbit directly around the sun?

  • planets
  • comets
  • moons
  • all of the above
  • 13. 
    The moon most likely formed

  • from a collision of Earth with a Mars-sized object.
  • in another region of space and drifted toward Earth.
  • from material in the solar system that came together.
  • in the same way as Earth was formed.
  • 14. 
    Astronomers classify stars according to their

  • distance from Earth.
  • color, size, and absolute brightness.
  • age and parallax.
  • all of the above
  • 15. 
    Ocean tides are the result of

  • the rotation of Earth.
  • the sun’s gravitational pull on Earth.
  • changes in Earth’s orbital position around the sun.
  • differences in both the sun’s and moon’s gravitational pull on Earth.
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