Our Galaxy: The Milky Way

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Questions Bank

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
Our Galaxy: The Milky Way
Modern Cosmology and the Origin of Structure
Life in the Universe

All Questions

Question 1

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True/False

The average density of the interstellar medium is many times less dense than the best vacuum on Earth.

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False

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Question 2

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True/False

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

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False

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Question 3

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True/False

We observe molecular hydrogen gas (H₂)using 21-cm emission.

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True

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Question 4

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True/False

The coldest molecular clouds in our galaxy have temperatures of approximately 1000 K.

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Question 5

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True/False

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

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Question 6

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Neutral hydrogen atoms are found only inside dense clouds where they are shielded from stellar radiation.

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Question 7

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The only effect of interstellar dust is that it makes objects appear redder than they really are.

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Question 8

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The dust in the interstellar medium comes primarily from stellar winds of main-sequence stars.

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Question 9

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Our galaxy is a typical barred spiral galaxy.

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Question 10

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Globular clusters have much higher stellar densities than the local solar neighborhood.

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Question 11

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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 12

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The Milky Way has two major spiral arms that emanate from the ends of its bar.

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Question 13

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

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Question 14

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Open clusters are only found in the disk of the Milky Way; globular clusters are only found in the halo of the Milky Way.

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Question 15

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There are many more individual stars residing in the Milky Way stellar halo than inside globular clusters.

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Question 16

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Every open star cluster in the Milky Way is younger than even the youngest globular cluster.

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Question 17

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The chemical abundance of a main-sequence star usually reflects how much nuclear burning has gone on inside it.

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Question 18

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Stars in the Milky Way that are 12 to 13 billion years old are only found in globular clusters.

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Question 19

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There is a 10⁹ M_ black hole at the center of the Milky Way that is rapidly accreting stars and gas.

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Question 20

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

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Our Galaxy: The Milky Way

The average density of the interstellar medium is many times less dense than the best vacuum on Earth.

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

We observe molecular hydrogen gas (H2)using 21-cm emission.

The coldest molecular clouds in our galaxy have temperatures of approximately 1000 K.

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

Neutral hydrogen atoms are found only inside dense clouds where they are shielded from stellar radiation.

The only effect of interstellar dust is that it makes objects appear redder than they really are.

The dust in the interstellar medium comes primarily from stellar winds of main-sequence stars.

Our galaxy is a typical barred spiral galaxy.

Globular clusters have much higher stellar densities than the local solar neighborhood.

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

The Milky Way has two major spiral arms that emanate from the ends of its bar.

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

Open clusters are only found in the disk of the Milky Way; globular clusters are only found in the halo of the Milky Way.

There are many more individual stars residing in the Milky Way stellar halo than inside globular clusters.

Every open star cluster in the Milky Way is younger than even the youngest globular cluster.

The chemical abundance of a main-sequence star usually reflects how much nuclear burning has gone on inside it.

Stars in the Milky Way that are 12 to 13 billion years old are only found in globular clusters.

There is a 109 M black hole at the center of the Milky Way that is rapidly accreting stars and gas.

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

We observe molecular hydrogen gas (H₂)using 21-cm emission.

There is a 10⁹ M_ black hole at the center of the Milky Way that is rapidly accreting stars and gas.