Question 1

How did astronomers determine that elliptical galaxies are composed mostly of dark matter?

Accepted Answer

A)  They measured X-ray emission from hot gas gravitationally bound to the galaxies. 
B)  They measured the rotation rates of gas as a function of distance from the centers of the galaxies. 
C)  They measured the amount of gravitational pull elliptical galaxies have on companion galaxies. 
D)  They assumed that the proportion of dark matter was roughly the same as in spiral galaxies. 
A)  They measured X-ray emission from hot gas gravitationally bound to the galaxies. 
B)  They measured the rotation rates of gas as a function of distance from the centers of the galaxies. 
C)  They measured the amount of gravitational pull elliptical galaxies have on companion galaxies. 
D)  They assumed that the proportion of dark matter was roughly the same as in spiral galaxies.

Question 2

The Hubble tuning fork diagram represents an evolutionary diagram of galaxies from elliptical
to spiral.

Accepted Answer

A) True 
 B)False

Question 3

The type of AGN we see depends mostly on the angle at which we view the galaxy.

Accepted Answer

A) True 
 B)False

Question 4

Dark matter is distributed inside galaxies in exactly the same way as luminous matter,although the total mass of dark matter is much larger than that of luminous matter.

Accepted Answer

A) True 
 B)False

Question 5

We can determine the 3-dimensional shape of any individual elliptical galaxy by photographing it.

Accepted Answer

A) True 
 B)False

Question 6

Stars in elliptical galaxies have velocities that

Accepted Answer

A)  are random in direction. 
B)  are very large in size. 
C)  are equal in all directions. 
D)  are constant in time. 
A)  are random in direction. 
B)  are very large in size. 
C)  are equal in all directions. 
D)  are constant in time.

Question 7

Active star formation does not occur in elliptical galaxies because they

Accepted Answer

A)  rotate too fast. 
B)  contain little molecular hydrogen. 
C)  are too massive. 
D)  are too far away. 
A)  rotate too fast. 
B)  contain little molecular hydrogen. 
C)  are too massive. 
D)  are too far away.

Question 8

The 3-dimensional shape of an elliptical galaxy depends on the average velocity of its stars along each of the three axes.

Accepted Answer

A) True 
 B)False

Question 9

If the rotational speed of the gas in the disk of a spiral galaxy is 200 km/s at a distance of 80,000 light-years from its center,then what is the mass enclosed within this radius?

Accepted Answer

A)    
B)    
C)    
D)    
A)    
B)    
C)    
D)

How did astronomers determine that elliptical galaxies are composed mostly of dark matter?

The Hubble tuning fork diagram represents an evolutionary diagram of galaxies from elliptical to spiral.

The type of AGN we see depends mostly on the angle at which we view the galaxy.

Dark matter is distributed inside galaxies in exactly the same way as luminous matter,although the total mass of dark matter is much larger than that of luminous matter.

We can determine the 3-dimensional shape of any individual elliptical galaxy by photographing it.

Stars in elliptical galaxies have velocities that

Active star formation does not occur in elliptical galaxies because they

The 3-dimensional shape of an elliptical galaxy depends on the average velocity of its stars along each of the three axes.

If the rotational speed of the gas in the disk of a spiral galaxy is 200 km/s at a distance of 80,000 light-years from its center,then what is the mass enclosed within this radius?

Why Learn Astronomy

Patterns in the Skymotions of Earth

Gravity and Orbitsa Celestial Ballet

Light

The Tools of the Astronomer

The Birth and Evolution of Planetary Systems

The Terrestrial Planets and Earths Moon

Atmospheres of the Terrestrial Planets

Worlds of Gas and Liquidthe Giant Planets

Gravity Is More Than Keplers Laws

Planetary Adornmentsmoons and Rings

Dwarf Planets and Small Solar System Bodies

Taking the Measure of Stars

A Run-Of-The-Mill G-Type Starour Sun

Star Formation and the Interstellar Medium

Stars in the Slow Lanelow-Mass Stellar Evolution

Live Fast,die Younghigh-Mass Stellar Evolution

Our Expanding Universe

The Milky Waya Normal Spiral Galaxy

Modern Cosmology

The Origin of Structure

Life

Filters

Exam 19: Galaxies

How did astronomers determine that elliptical galaxies are composed mostly of dark matter?

The Hubble tuning fork diagram represents an evolutionary diagram of galaxies from elliptical to spiral.

The type of AGN we see depends mostly on the angle at which we view the galaxy.

Dark matter is distributed inside galaxies in exactly the same way as luminous matter,although the total mass of dark matter is much larger than that of luminous matter.

We can determine the 3-dimensional shape of any individual elliptical galaxy by photographing it.

Stars in elliptical galaxies have velocities that

Active star formation does not occur in elliptical galaxies because they

The 3-dimensional shape of an elliptical galaxy depends on the average velocity of its stars along each of the three axes.

If the rotational speed of the gas in the disk of a spiral galaxy is 200 km/s at a distance of 80,000 light-years from its center,then what is the mass enclosed within this radius?

Why Learn Astronomy

Patterns in the Skymotions of Earth

Gravity and Orbitsa Celestial Ballet

Light

The Tools of the Astronomer

The Birth and Evolution of Planetary Systems

The Terrestrial Planets and Earths Moon

Atmospheres of the Terrestrial Planets

Worlds of Gas and Liquidthe Giant Planets

Gravity Is More Than Keplers Laws

Planetary Adornmentsmoons and Rings

Dwarf Planets and Small Solar System Bodies

Taking the Measure of Stars

A Run-Of-The-Mill G-Type Starour Sun

Star Formation and the Interstellar Medium

Stars in the Slow Lanelow-Mass Stellar Evolution

Live Fast,die Younghigh-Mass Stellar Evolution

Our Expanding Universe

The Milky Waya Normal Spiral Galaxy

Modern Cosmology

The Origin of Structure

Life

Filters