Exam 16: Our Galaxy: The Milky Way

If you wanted to study the properties of nearby stars that were some of the first stars to form in the Milky Way,but were NOT members of a globular cluster,how could you go about finding them?

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Question 1

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You would look for stars that were members of the Milky Way halo.The stars would have highly elliptical orbits,not rotating like other disk stars,and you could identify them by the very high velocities they have as they pass through the solar neighborhood.Also,you could identify halo stars by their low chemical abundance,and main-sequence halo stars by their relatively bluer colors than disk stars.

Cosmic rays come mostly from extragalactic sources and contribute little to the overall energy balance in the Milky Way disk.

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Question 2

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The AVERAGE density of the interstellar medium is:

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Question 3

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In the figure below,the spectrum of a star is given without being obscured by dust and also being obscured by dust.Explain how the dust affects the light arriving from the star.

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Question 4

If you wanted to study regions where star formation is currently happening you could use:

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Question 5

Most of the mass in our galaxy is in the form of:

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Question 6

In a star that has a chemical abundance similar to the Sun,what percentage of its mass is made of heavy elements?

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Question 7

Halo stars formed before gas in the Milky Way collapsed to form the disk.

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Question 8

Stars forming in molecular clouds tend to form first in the low-density periphery.

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Question 9

At what wavelength are H II regions most clearly visible,and why do H II regions mark the regions where new stars are currently being formed?

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Question 10

When radiation from an object passes through the interstellar medium:

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Question 11

Sagittarius A*,the radio source located at the center of our galaxy,is believed to be:

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Question 12

Explain how a standard candle allows you to determine the distance to an object.What is it that you have to measure or know about the standard candle to derive its distance?

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Question 13

Where are the most metal-rich stars found in the Milky Way?

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Question 14

The lowest-density gas in the interstellar medium is also the coldest.

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Question 15

Our galaxy is classified as an Sd galaxy in the Hubble sequence.

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Question 16

Why is the supermassive black hole in the center of our galaxy not an AGN right now? Could it be active in the future? Why or why not?

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Question 17

Molecular clouds are best observed at __________ wavelengths.

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Question 18

Which of the following are NOT found in our galaxy's halo?

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Question 19

Describe the differences between the ages and chemical abundances of globular and open star clusters.

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Question 20

Showing 1 - 20 of 80

If you wanted to study the properties of nearby stars that were some of the first stars to form in the Milky Way,but were NOT members of a globular cluster,how could you go about finding them?

Cosmic rays come mostly from extragalactic sources and contribute little to the overall energy balance in the Milky Way disk.

The AVERAGE density of the interstellar medium is:

In the figure below,the spectrum of a star is given without being obscured by dust and also being obscured by dust.Explain how the dust affects the light arriving from the star.

If you wanted to study regions where star formation is currently happening you could use:

Most of the mass in our galaxy is in the form of:

In a star that has a chemical abundance similar to the Sun,what percentage of its mass is made of heavy elements?

Halo stars formed before gas in the Milky Way collapsed to form the disk.

Stars forming in molecular clouds tend to form first in the low-density periphery.

At what wavelength are H II regions most clearly visible,and why do H II regions mark the regions where new stars are currently being formed?

When radiation from an object passes through the interstellar medium:

Sagittarius A*,the radio source located at the center of our galaxy,is believed to be:

Explain how a standard candle allows you to determine the distance to an object.What is it that you have to measure or know about the standard candle to derive its distance?

Where are the most metal-rich stars found in the Milky Way?

The lowest-density gas in the interstellar medium is also the coldest.

Our galaxy is classified as an Sd galaxy in the Hubble sequence.

Why is the supermassive black hole in the center of our galaxy not an AGN right now? Could it be active in the future? Why or why not?

Molecular clouds are best observed at __________ wavelengths.

Which of the following are NOT found in our galaxy's halo?

Describe the differences between the ages and chemical abundances of globular and open star clusters.

Our Place in the Universe

Patterns in the Skymotions of Earth

Laws of Motion

Light and Telescopes

The Formation of Stars and Planets

Terrestrial Worlds in the Inner Solar System

Atmospheres of Venus, Earth, and Mars

The Giant Planets

Small Bodies of the Solar System

Measuring the Stars

Our Star: The Sun

Evolution of Low-Mass Stars

Evolution of High-Mass Stars

The Expansion of Space

The Realm of the Galaxies

Modern Cosmology and the Origin of Structure

Life in the Universe

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