Gr 8 Natural Sciences Ch 4.2: The Milky Way Galaxy

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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?

Galactic Bulge Signup and view all the answers

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

Galactic Disk Signup and view all the answers

How many major spiral arms does the Milky Way have?

5 Signup and view all the answers

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

Galaxies Kuklos Signup and view all the answers

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

Dust lanes Signup and view all the answers

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

225 million years Signup and view all the answers

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

A giant fried egg Signup and view all the answers

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

Fewer stars Signup and view all the answers

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

12.5 billion years 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?

The dense concentration of stars in the Sagittarius Arm Signup and view all the answers

How many globular clusters does the Milky Way have?

160 Signup and view all the answers

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

Gravity Signup and view all the answers

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

200 billion Signup and view all the answers

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

They are cool and old Signup and view all the answers

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

Spiral Signup and view all the answers

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

They are regions of star formation Signup and view all the answers

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

They revolve around the galaxy's center Signup and view all the answers

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

A hazy band of light with dark patches Signup and view all the answers

What is the characteristic of the galaxy disk?

It contains younger stars and dust 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?

The galaxy is extremely large Signup and view all the answers

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

A dense concentration of stars Signup and view all the answers

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

They are old and tightly packed together 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?

Younger Signup and view all the answers

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

A giant fried egg Signup and view all the answers

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

Fewer stars 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?

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

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

They are younger and hotter than the stars in the Perseus Arm Signup and view all the answers

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

It is a region of older stars and low star formation 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?

They are revolving around the center Signup and view all the answers

What is the characteristic of the galaxy disk?

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

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

Due to the distribution of stars and gas in the galaxy Signup and view all the answers

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

They are older and cooler than the stars in the galaxy disk Signup and view all the answers

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

Gravity 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?

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

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

They contain hundreds of thousands of ancient stars 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?

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

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

It is the dense concentration of stars visible from Earth as a hazy band of light 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?

Due to the immense size of the galaxy 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?

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

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?

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

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

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

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

How many major spiral arms does the Milky Way have?

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

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

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

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

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

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

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

How many globular clusters does the Milky Way have?

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

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

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

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

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

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

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

What is the characteristic of the galaxy disk?

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

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

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

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

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

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

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

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

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

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

What is the characteristic of the galaxy disk?

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

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

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

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

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

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

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

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

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

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