Question 1

During the main-sequence evolution of a massive star,increasingly heavier elements are fused in the core,giving the core support for

Accepted Answer

A)  decreasingly shorter times. 
B)  increasingly longer times. 
C)  an approximately equal amount of time. 
D)  approximately 10,000 years. 
A)  decreasingly shorter times. 
B)  increasingly longer times. 
C)  an approximately equal amount of time. 
D)  approximately 10,000 years.

Question 2

Suppose you observe three star clusters.Cluster 1 has a main-sequence turnoff point at spectral type G,Cluster 2 has a turnoff point at spectral type A,and Cluster 3 has a turnoff point at spectral type B.Which cluster is youngest and which is oldest? Explain why.What is the approximate age of the oldest cluster?

Accepted Answer

Of the three types of main-sequence turn

Question 3

Which of the following is a consequence of Einstein's special theory of relativity?

Accepted Answer

A)  Moving clocks run quicker. 
B)  The velocity of light depends on the speed of the observer. 
C)  Distances appear shorter when traveling near the speed of light. 
D)  Gravity arises because mass distorts spacetime. 
A)  Moving clocks run quicker. 
B)  The velocity of light depends on the speed of the observer. 
C)  Distances appear shorter when traveling near the speed of light. 
D)  Gravity arises because mass distorts spacetime.

Question 4

Suppose you measured H-R diagrams for the two star clusters pictured below.Which cluster is older? Which cluster is farther away? Explain why.

Accepted Answer

The spectral type of Cluster A's main-se

Question 5

An   star will eventually die as a Type I supernova.

Accepted Answer

A) True 
 B)False

Question 6

Neutron stars have masses that range from

Accepted Answer

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

Question 7

While traveling the galaxy in a spacecraft,you and a colleague set out to investigate a   black hole.Your colleague hops aboard an escape pod and drops into a circular orbit around the black hole maintaining a distance of 50 km from it,while you remain much farther away inside the spacecraft.After doing some experiments to measure the strength of gravity,your colleague signals the results back to you using a green laser.What would you see,and why?

Accepted Answer

What you see depends on where your colle

Question 8

How do Cepheid variable stars differ from RR Lyrae variable stars in their masses,luminosities,and periods?

Accepted Answer

Cepheids are supergiant,massive stars,wh

Question 9

If the Sun were to be instantly replaced by a   black hole,the gravitational pull of the black hole on Earth would be

Accepted Answer

A)  much greater than it is now. 
B)  the same as it is now. 
C)  much smaller than it is now. 
D)  irrelevant because Earth would be quickly obliterated by the strong tidal force of the black hole. 
A)  much greater than it is now. 
B)  the same as it is now. 
C)  much smaller than it is now. 
D)  irrelevant because Earth would be quickly obliterated by the strong tidal force of the black hole.

Question 10

Gravitational lensing allows us to see distant objects that would otherwise be blocked by a star or galaxy.

Accepted Answer

A) True 
 B)False

During the main-sequence evolution of a massive star,increasingly heavier elements are fused in the core,giving the core support for

Which of the following is a consequence of Einstein's special theory of relativity?

Suppose you measured H-R diagrams for the two star clusters pictured below.Which cluster is older? Which cluster is farther away? Explain why.

An star will eventually die as a Type I supernova.

Neutron stars have masses that range from

How do Cepheid variable stars differ from RR Lyrae variable stars in their masses,luminosities,and periods?

If the Sun were to be instantly replaced by a black hole,the gravitational pull of the black hole on Earth would be

Gravitational lensing allows us to see distant objects that would otherwise be blocked by a star or galaxy.

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

Our Expanding Universe

Galaxies

The Milky Waya Normal Spiral Galaxy

Modern Cosmology

The Origin of Structure

Life

Filters

Exam 17: Live Fast,die Younghigh-Mass Stellar Evolution

During the main-sequence evolution of a massive star,increasingly heavier elements are fused in the core,giving the core support for

Which of the following is a consequence of Einstein's special theory of relativity?

Suppose you measured H-R diagrams for the two star clusters pictured below.Which cluster is older? Which cluster is farther away? Explain why.

An star will eventually die as a Type I supernova.

Neutron stars have masses that range from

How do Cepheid variable stars differ from RR Lyrae variable stars in their masses,luminosities,and periods?

If the Sun were to be instantly replaced by a black hole,the gravitational pull of the black hole on Earth would be

Gravitational lensing allows us to see distant objects that would otherwise be blocked by a star or galaxy.

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

Our Expanding Universe

Galaxies

The Milky Waya Normal Spiral Galaxy

Modern Cosmology

The Origin of Structure

Life

Filters