Gr 8 Natural Sciences Ch 4.2: The Milky Way Galaxy
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Questions and Answers

What is the definition of a galaxy?

  • A small collection of stars, gas, and dust
  • A massive collection of stars, gas, and dust held together by gravity (correct)
  • A region of space devoid of stars and gas
  • A type of black hole

    • What is the name of the arm where our Sun is situated?

  • Norma Arm
  • Cygnus Arm
  • Sagittarius Arm
  • Orion Arm (correct)

    • What is the speed at which our Solar System travels around the galaxy's center?

  • 1000 km/s
  • 250 km/s (correct)
  • 500 km/s
  • 100 km/s

    • What is the name of the central part of the galaxy?

    <p>Galactic Bulge</p> Signup and view all the answers

    What is the name of the region filled with dust, gas, and hot young stars?

    <p>Galactic Disk</p> Signup and view all the answers

    How many major spiral arms does the Milky Way have?

    <p>5</p> Signup and view all the answers

    What is the name of the ancient Greek term for the Milky Way?

    <p>Galaxies Kuklos</p> Signup and view all the answers

    What appears as dark wisps in the bluish regions of the galaxy?

    <p>Dust lanes</p> Signup and view all the answers

    How long does it take the Sun to complete one orbit around the galactic center?

    <p>225 million years</p> Signup and view all the answers

    What is the shape of the Milky Way galaxy when viewed from the side?

    <p>A giant fried egg</p> Signup and view all the answers

    What can be seen above and below the plane of the galaxy disk?

    <p>Fewer stars</p> Signup and view all the answers

    What is the approximate age of the oldest stars in the Milky Way's globular clusters?

    <p>12.5 billion years</p> Signup and view all the answers

    What is the hazy band of light seen in the night sky when observing the Milky Way from Earth?

    <p>The dense concentration of stars in the Sagittarius Arm</p> Signup and view all the answers

    How many globular clusters does the Milky Way have?

    <p>160</p> Signup and view all the answers

    What is the primary force that holds the Milky Way galaxy together?

    <p>Gravity</p> Signup and view all the answers

    What is the approximate number of stars in the Milky Way galaxy?

    <p>200 billion</p> Signup and view all the answers

    What is the characteristic of the stars in the galactic bulge?

    <p>They are cool and old</p> Signup and view all the answers

    What is the shape of the Milky Way galaxy when viewed from above?

    <p>Spiral</p> Signup and view all the answers

    What is the purpose of the galaxy's spiral arms?

    <p>They are regions of star formation</p> Signup and view all the answers

    What is the movement of stars in the Milky Way galaxy?

    <p>They revolve around the galaxy's center</p> Signup and view all the answers

    What can be observed from Earth when viewing the Milky Way galaxy?

    <p>A hazy band of light with dark patches</p> Signup and view all the answers

    What is the characteristic of the galaxy disk?

    <p>It contains younger stars and dust</p> Signup and view all the answers

    What is the main reason why it takes so long for the Sun to complete one orbit around the galactic center?

    <p>The galaxy is extremely large</p> Signup and view all the answers

    What can be observed in the Sagittarius Arm when looking towards the galaxy's center?

    <p>A dense concentration of stars</p> Signup and view all the answers

    What is the characteristic of the stars found in globular clusters?

    <p>They are old and tightly packed together</p> Signup and view all the answers

    What is the age of our Sun compared to the oldest stars in the Milky Way's globular clusters?

    <p>Younger</p> Signup and view all the answers

    What is the shape of the Milky Way galaxy when viewed from an angle?

    <p>A giant fried egg</p> Signup and view all the answers

    What can be seen above and below the plane of the galaxy disk?

    <p>Fewer stars</p> Signup and view all the answers

    What is the primary reason why the Milky Way appears as a hazy band of light in the night sky?

    <p>Because of the scattering of light by dust and gas in the galaxy disk</p> Signup and view all the answers

    What is the characteristic of the stars in the Norma Arm?

    <p>They are younger and hotter than the stars in the Perseus Arm</p> Signup and view all the answers

    What is the purpose of the galaxy's central bulge?

    <p>It is a region of older stars and low star formation</p> Signup and view all the answers

    What is the movement of the stars in the Milky Way galaxy with respect to the galaxy's center?

    <p>They are revolving around the center</p> Signup and view all the answers

    What is the characteristic of the galaxy disk?

    <p>It is a region of younger stars and high gas content</p> Signup and view all the answers

    What is the reason why the Milky Way galaxy appears as a giant spiral when viewed from above?

    <p>Due to the distribution of stars and gas in the galaxy</p> Signup and view all the answers

    What is the characteristic of the stars in the galaxy bulge?

    <p>They are older and cooler than the stars in the galaxy disk</p> Signup and view all the answers

    What is the primary force that holds the Milky Way galaxy together?

    <p>Gravity</p> Signup and view all the answers

    What is the primary reason why the Milky Way galaxy appears as a giant fried egg when viewed from the side?

    <p>As a result of the galaxy's disk being much wider than it is thick</p> Signup and view all the answers

    What is the significance of the globular clusters in the Milky Way galaxy?

    <p>They contain hundreds of thousands of ancient stars</p> Signup and view all the answers

    What is the relationship between the age of the oldest stars in the Milky Way's globular clusters and the age of the Universe?

    <p>The oldest stars in the globular clusters are almost as old as the Universe</p> Signup and view all the answers

    What is the significance of the Sagittarius Arm in the Milky Way galaxy?

    <p>It is the dense concentration of stars visible from Earth as a hazy band of light</p> Signup and view all the answers

    What is the primary reason why the Milky Way galaxy takes approximately 225 million years to complete one orbit around the galactic center?

    <p>Due to the immense size of the galaxy</p> Signup and view all the answers

    What is the significance of the age of our Sun compared to the oldest stars in the Milky Way's globular clusters?

    <p>Our Sun is younger than the oldest stars in the globular clusters</p> Signup and view all the answers

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