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Galaxy Mass

Description: This quiz will test your understanding of galaxy mass, including its measurement, distribution, and significance.
Number of Questions: 15
Created by:
Tags: astronomy galaxies galaxy mass
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What is the most common method used to measure the mass of a galaxy?

  1. Measuring the galaxy's luminosity

  2. Measuring the galaxy's rotation curve

  3. Measuring the galaxy's gravitational lensing

  4. Measuring the galaxy's X-ray emission

Show answer
Correct Option: B
Explanation:

The rotation curve of a galaxy is a plot of the rotational velocity of its stars as a function of their distance from the galaxy's center. The mass of the galaxy can be inferred from the shape of the rotation curve.

What is the distribution of mass within a galaxy?

  1. The mass is evenly distributed throughout the galaxy.

  2. The mass is concentrated in the galaxy's center.

  3. The mass is concentrated in the galaxy's halo.

  4. The mass is concentrated in the galaxy's spiral arms.

Show answer
Correct Option: B
Explanation:

The mass of a galaxy is concentrated in its center, where the stars are most densely packed. The mass decreases with increasing distance from the center.

What is the significance of galaxy mass?

  1. Galaxy mass determines the galaxy's luminosity.

  2. Galaxy mass determines the galaxy's size.

  3. Galaxy mass determines the galaxy's shape.

  4. Galaxy mass determines the galaxy's evolution.

Show answer
Correct Option: D
Explanation:

Galaxy mass is a key factor in determining the galaxy's evolution. More massive galaxies are more likely to merge with other galaxies, and they are also more likely to form stars.

What is the typical mass of a galaxy?

  1. 10^8 Msun

  2. 10^10 Msun

  3. 10^12 Msun

  4. 10^14 Msun

Show answer
Correct Option:
Explanation:

The typical mass of a galaxy is about 10^11 Msun. This is the mass of the Milky Way galaxy.

What is the mass of the largest known galaxy?

  1. 10^12 Msun

  2. 10^13 Msun

  3. 10^14 Msun

  4. 10^15 Msun

Show answer
Correct Option: D
Explanation:

The mass of the largest known galaxy is about 10^15 Msun. This is the mass of the galaxy M87, which is located in the Virgo cluster.

What is the mass of the smallest known galaxy?

  1. 10^5 Msun

  2. 10^6 Msun

  3. 10^7 Msun

  4. 10^8 Msun

Show answer
Correct Option: A
Explanation:

The mass of the smallest known galaxy is about 10^5 Msun. This is the mass of the galaxy Segue 1, which is located in the constellation Pegasus.

How does the mass of a galaxy affect its luminosity?

  1. The more massive a galaxy is, the more luminous it is.

  2. The more massive a galaxy is, the less luminous it is.

  3. The mass of a galaxy has no effect on its luminosity.

  4. The mass of a galaxy is inversely proportional to its luminosity.

Show answer
Correct Option: A
Explanation:

The more massive a galaxy is, the more stars it contains. Stars are the source of a galaxy's luminosity, so more massive galaxies are more luminous.

How does the mass of a galaxy affect its size?

  1. The more massive a galaxy is, the larger it is.

  2. The more massive a galaxy is, the smaller it is.

  3. The mass of a galaxy has no effect on its size.

  4. The mass of a galaxy is inversely proportional to its size.

Show answer
Correct Option: A
Explanation:

The more massive a galaxy is, the more stars it contains. Stars take up space, so more massive galaxies are larger.

How does the mass of a galaxy affect its shape?

  1. The more massive a galaxy is, the more elliptical it is.

  2. The more massive a galaxy is, the more spiral it is.

  3. The mass of a galaxy has no effect on its shape.

  4. The mass of a galaxy is inversely proportional to its shape.

Show answer
Correct Option: A
Explanation:

The more massive a galaxy is, the more tightly its stars are bound to its center. This causes the galaxy to be more elliptical.

How does the mass of a galaxy affect its evolution?

  1. The more massive a galaxy is, the faster it evolves.

  2. The more massive a galaxy is, the slower it evolves.

  3. The mass of a galaxy has no effect on its evolution.

  4. The mass of a galaxy is inversely proportional to its evolution.

Show answer
Correct Option: A
Explanation:

The more massive a galaxy is, the more likely it is to merge with other galaxies. Mergers can trigger star formation and other processes that cause the galaxy to evolve more quickly.

What is the dark matter halo of a galaxy?

  1. A region of space around a galaxy that contains a large amount of dark matter.

  2. A region of space around a galaxy that contains a large amount of visible matter.

  3. A region of space around a galaxy that contains a large amount of both dark matter and visible matter.

  4. A region of space around a galaxy that contains no matter at all.

Show answer
Correct Option: A
Explanation:

The dark matter halo of a galaxy is a region of space around the galaxy that contains a large amount of dark matter. Dark matter is a type of matter that does not emit or reflect light, so it cannot be seen directly. However, its presence can be inferred from its gravitational effects.

What is the role of dark matter in galaxy mass?

  1. Dark matter contributes to the mass of a galaxy.

  2. Dark matter does not contribute to the mass of a galaxy.

  3. Dark matter is the only type of matter that contributes to the mass of a galaxy.

  4. Dark matter is the only type of matter that does not contribute to the mass of a galaxy.

Show answer
Correct Option: A
Explanation:

Dark matter contributes to the mass of a galaxy. In fact, dark matter is thought to make up about 85% of the mass of the Milky Way galaxy.

How is the mass of a galaxy measured?

  1. By measuring the galaxy's luminosity.

  2. By measuring the galaxy's rotation curve.

  3. By measuring the galaxy's gravitational lensing.

  4. By measuring the galaxy's X-ray emission.

Show answer
Correct Option: B
Explanation:

The mass of a galaxy is measured by measuring the galaxy's rotation curve. The rotation curve of a galaxy is a plot of the rotational velocity of its stars as a function of their distance from the galaxy's center. The mass of the galaxy can be inferred from the shape of the rotation curve.

What is the relationship between the mass of a galaxy and its luminosity?

  1. The mass of a galaxy is directly proportional to its luminosity.

  2. The mass of a galaxy is inversely proportional to its luminosity.

  3. The mass of a galaxy is independent of its luminosity.

  4. The mass of a galaxy is inversely proportional to the square of its luminosity.

Show answer
Correct Option: A
Explanation:

The mass of a galaxy is directly proportional to its luminosity. This means that more massive galaxies are more luminous.

What is the relationship between the mass of a galaxy and its size?

  1. The mass of a galaxy is directly proportional to its size.

  2. The mass of a galaxy is inversely proportional to its size.

  3. The mass of a galaxy is independent of its size.

  4. The mass of a galaxy is inversely proportional to the square of its size.

Show answer
Correct Option: A
Explanation:

The mass of a galaxy is directly proportional to its size. This means that more massive galaxies are larger.

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