Question 1

The energy source at the center of our galaxy is called

Accepted Answer

A) Cygnus X-1. 
B) the Orion arm. 
C) the Sun. 
D) Sagittarius A*. 
A) Cygnus X-1. 
B) the Orion arm. 
C) the Sun. 
D) Sagittarius A*.

Question 2

Radio maps of the spiral arms of our galaxy

Accepted Answer

A) reveal that our galaxy is a grand design spiral. 
B) map the location of hot O and B stars by the radio radiation they emit. 
C) reveal that the spiral arms are winding up and growing closer together. 
D) reveal that the Sun is currently located in the center of a spiral arm. 
E) map the location of dense neutral hydrogen clouds. 
A) reveal that our galaxy is a grand design spiral. 
B) map the location of hot O and B stars by the radio radiation they emit. 
C) reveal that the spiral arms are winding up and growing closer together. 
D) reveal that the Sun is currently located in the center of a spiral arm. 
E) map the location of dense neutral hydrogen clouds.

Question 3

The first scientific attempt to map the Milky Way galaxy

Accepted Answer

A) showed that the Sun was located in the center of the system of planets making up our galaxy. 
B) showed that our galaxy is a round ball on which we live. 
C) showed that our galaxy has 9 stars. 
D) used globular clusters to determine the location of the center of the Earth. 
E) was completed by William and Caroline Herschel. 
A) showed that the Sun was located in the center of the system of planets making up our galaxy. 
B) showed that our galaxy is a round ball on which we live. 
C) showed that our galaxy has 9 stars. 
D) used globular clusters to determine the location of the center of the Earth. 
E) was completed by William and Caroline Herschel.

Question 4

What evidence do we have that the center of our galaxy contains magnetic fields

Accepted Answer

Peculiar features su

Question 5

Almost every celestial object we see in the sky on a dark, clear night is within the Milky Way galaxy.

Accepted Answer

A) True 
 B)False

Question 6

The traditional "top-down" hypothesis states that the galaxy formed

Accepted Answer

A) from a large spherical cloud of gas that was rotating very slowly. 
B) from a large cloud of material that broke off a larger galaxy. 
C) from material that had been ejected in the violent explosion of a dying galaxy. 
D) as a result of mergers between several smaller groups of gas, dust, and stars. 
E) as two massive galaxies collided. 
A) from a large spherical cloud of gas that was rotating very slowly. 
B) from a large cloud of material that broke off a larger galaxy. 
C) from material that had been ejected in the violent explosion of a dying galaxy. 
D) as a result of mergers between several smaller groups of gas, dust, and stars. 
E) as two massive galaxies collided.

Question 7

The mass of the black hole at the center of our galaxy can be estimated using the ____ of a star orbiting it.

Accepted Answer

A) semi-major axis 
B) orbital period 
C) semi-major axis and orbital period 
D) neither semi-major axis nor orbital period 
A) semi-major axis 
B) orbital period 
C) semi-major axis and orbital period 
D) neither semi-major axis nor orbital period

Question 8

The spherical component is the __________.

Accepted Answer

A) halo 
B) bulge 
C) halo and bulge 
D) dark matter 
A) halo 
B) bulge 
C) halo and bulge 
D) dark matter

Question 9

What behavior do galactic rotation curves exhibit to suggest the existence of dark matter in an extended halo

Accepted Answer

A) Small velocities are seen at large distances from the galactic center. 
B) Small velocities are seen at distances close to the galactic center. 
C) Large velocities are seen at large distances from the galactic center. 
D) Large velocities are seen at distances close to the galactic center. 
A) Small velocities are seen at large distances from the galactic center. 
B) Small velocities are seen at distances close to the galactic center. 
C) Large velocities are seen at large distances from the galactic center. 
D) Large velocities are seen at distances close to the galactic center.

Question 10

Sgr A* is believed to be the center of the Milky Way galaxy because 
I.it lies in the general direction of the center of the galaxy based on observations of globular clusters in the plane of the Milky Way.
II.long-wavelength dust-penetrating images show it to be a region crowded with stars.
III.orbits of stars around it indicate a mass several million times that of the Sun within a volume a few light hours in size.
IV.radio observations show it is a concentrated source at the center of swirling clouds of gas.

Accepted Answer

A) I & II only 
B) II & III only 
C) I & IV only 
D) II & IV only 
E) All of I, II, III, & IV 
A) I & II only 
B) II & III only 
C) I & IV only 
D) II & IV only 
E) All of I, II, III, & IV

Question 11

-In which direction is the above spiral galaxy rotating and which color best represents where the gas is being compressed by the spiral density wave

Accepted Answer

A) clockwise, blue 
B) counter-clockwise, pink 
C) clockwise, pink 
D) counter-clockwise, blue 
A) clockwise, blue 
B) counter-clockwise, pink 
C) clockwise, pink 
D) counter-clockwise, blue

Question 12

Old stars are poor in heavy elements because there were very few previous generations of stars before the old stars formed.

Accepted Answer

A) True 
 B)False

Question 13

Any element heavier than helium is collectively referred to as a _______________.

Accepted Answer

The answer of Any element heavier than helium is collectively...

Question 14

The center of our galaxy is believed to be occupied by the radio source known as ____________________.

Accepted Answer

Sgr A*
Sag

Question 15

The orbits of population I stars 
I.are confined to disk of the galaxy.
II.are very elliptical.
III.are nearly circular.
IV.are randomly inclined to the disk of the galaxy.

Accepted Answer

A) I 
B) IV 
C) I & IV 
D) II & IV 
E) I & III 
A) I 
B) IV 
C) I & IV 
D) II & IV 
E) I & III

Question 16

The center of our galaxy is located in the direction of the constellation of Orion.

Accepted Answer

A) True 
 B)False

Question 17

Giant molecular cloud complexes are located in spiral arms.

Accepted Answer

A) True 
 B)False

Question 18

Compared to stars within the disk, halo stars

Accepted Answer

A) orbit at random inclinations to the galactic plane 
B) orbit at different speeds 
C) orbit with paths crossing 
D) All of the other choices are correct. 
A) orbit at random inclinations to the galactic plane 
B) orbit at different speeds 
C) orbit with paths crossing 
D) All of the other choices are correct.

Question 19

RR Lyrae stars are in the constellation ___________.

Accepted Answer

The answer of RR Lyrae stars are in the constellation...

Question 20

This is a "thought" question. Why are few galaxies outside our own galaxy seen by our eyes in the circle around the sky where the Milky Way is located This is because

Accepted Answer

A) there aren't any galaxies in those directions. 
B) dust in the Milky Way blots out our view of galaxies in those directions. 
C) the missing mass is in those directions. 
D) a massive explosion has blown galaxies away from those directions. 
A) there aren't any galaxies in those directions. 
B) dust in the Milky Way blots out our view of galaxies in those directions. 
C) the missing mass is in those directions. 
D) a massive explosion has blown galaxies away from those directions.

The energy source at the center of our galaxy is called

Radio maps of the spiral arms of our galaxy

The first scientific attempt to map the Milky Way galaxy

What evidence do we have that the center of our galaxy contains magnetic fields

Almost every celestial object we see in the sky on a dark, clear night is within the Milky Way galaxy.

The traditional "top-down" hypothesis states that the galaxy formed

The mass of the black hole at the center of our galaxy can be estimated using the ____ of a star orbiting it.

The spherical component is the __________.

What behavior do galactic rotation curves exhibit to suggest the existence of dark matter in an extended halo

-In which direction is the above spiral galaxy rotating and which color best represents where the gas is being compressed by the spiral density wave

Old stars are poor in heavy elements because there were very few previous generations of stars before the old stars formed.

Any element heavier than helium is collectively referred to as a _______________.

The center of our galaxy is believed to be occupied by the radio source known as ____________________.

The orbits of population I stars I.are confined to disk of the galaxy. II.are very elliptical. III.are nearly circular. IV.are randomly inclined to the disk of the galaxy.

The center of our galaxy is located in the direction of the constellation of Orion.

Giant molecular cloud complexes are located in spiral arms.

Compared to stars within the disk, halo stars

RR Lyrae stars are in the constellation ___________.

This is a "thought" question. Why are few galaxies outside our own galaxy seen by our eyes in the circle around the sky where the Milky Way is located This is because

Here and Now

A Users Guide to the Sky

Cycles of the Sun and Moon

The Origin of Modern Astronomy

Light and Telescopes

Atoms and Spectra

The Sun

The Family of Stars

The Formation and Structure of Stars

The Deaths of Stars

Neutron Stars and Black Holes

Galaxies: Normal and Active

Modern Cosmology

The Origin of the Solar System

Earth and Moon: Bases for Comparative Planetology

Mercury, Venus, and Mars

The Outer Solar System

Meteorites, Asteroids, and Comets

Astrobiology: Life on Other Worlds

Filters

Exam 12: The Milky Way Galaxy

The energy source at the center of our galaxy is called

Radio maps of the spiral arms of our galaxy

The first scientific attempt to map the Milky Way galaxy

What evidence do we have that the center of our galaxy contains magnetic fields

Almost every celestial object we see in the sky on a dark, clear night is within the Milky Way galaxy.

The traditional "top-down" hypothesis states that the galaxy formed

The mass of the black hole at the center of our galaxy can be estimated using the ____ of a star orbiting it.

The spherical component is the __________.

What behavior do galactic rotation curves exhibit to suggest the existence of dark matter in an extended halo

-In which direction is the above spiral galaxy rotating and which color best represents where the gas is being compressed by the spiral density wave

Old stars are poor in heavy elements because there were very few previous generations of stars before the old stars formed.

Any element heavier than helium is collectively referred to as a _______________.

The center of our galaxy is believed to be occupied by the radio source known as ____________________.

The orbits of population I stars I.are confined to disk of the galaxy. II.are very elliptical. III.are nearly circular. IV.are randomly inclined to the disk of the galaxy.

The center of our galaxy is located in the direction of the constellation of Orion.

Giant molecular cloud complexes are located in spiral arms.

Compared to stars within the disk, halo stars

RR Lyrae stars are in the constellation ___________.

This is a "thought" question. Why are few galaxies outside our own galaxy seen by our eyes in the circle around the sky where the Milky Way is located This is because

Here and Now

A Users Guide to the Sky

Cycles of the Sun and Moon

The Origin of Modern Astronomy

Light and Telescopes

Atoms and Spectra

The Sun

The Family of Stars

The Formation and Structure of Stars

The Deaths of Stars

Neutron Stars and Black Holes

Galaxies: Normal and Active

Modern Cosmology

The Origin of the Solar System

Earth and Moon: Bases for Comparative Planetology

Mercury, Venus, and Mars

The Outer Solar System

Meteorites, Asteroids, and Comets

Astrobiology: Life on Other Worlds

Filters