Question 1

Explain why stars displaying spectral lines of molecules must be relatively cool.

Accepted Answer

Molecules would brea

Question 2

The most distant stars we can measure stellar parallax for are approximately

Accepted Answer

A)  5 parsecs away. 
B)  100 parsecs away. 
C)  10,000 parsecs away. 
D)  halfway across the Milky Way Galaxy. 
E)  in the Andromeda Galaxy. 
A)  5 parsecs away. 
B)  100 parsecs away. 
C)  10,000 parsecs away. 
D)  halfway across the Milky Way Galaxy. 
E)  in the Andromeda Galaxy.

Question 3

Which o the following stars are brightest at ultraviolet wavelengths?

Accepted Answer

A)  O and B stars 
B)  A and F stars 
C)  G and K stars 
D)  M stars 
E)  none, all stars are brightest at optical wavelengths 
A)  O and B stars 
B)  A and F stars 
C)  G and K stars 
D)  M stars 
E)  none, all stars are brightest at optical wavelengths

Question 4

The faintest star visible to the naked eye has an apparent magnitude of about

Accepted Answer

A)  10. 
B)  6. 
C)  1. 
D)  0. 
E)  6.0 
A)  10. 
B)  6. 
C)  1. 
D)  0. 
E)  6.0

Question 5

A star with an apparent magnitude of 10 appears fainter than a star with an apparent magnitude of 9.

Accepted Answer

A) True 
 B)False

Question 6

Astronomers can measure a star's mass in only certain cases. Which one of the following cases might allow astronomers to measure a star's mass?

Accepted Answer

A)  The star is a member of a binary star system. 
B)  The star is of spectral type G. 
C)  The star is of spectral type A. 
D)  We know the star's luminosity and distance. 
A)  The star is a member of a binary star system. 
B)  The star is of spectral type G. 
C)  The star is of spectral type A. 
D)  We know the star's luminosity and distance.

Question 7

You observe a star and you want to plot it on an H-R diagram. You will need to measure all of the following, except the star's ________.

Accepted Answer

A)  mass 
B)  distance 
C)  apparent brightness 
D)  spectral type 
A)  mass 
B)  distance 
C)  apparent brightness 
D)  spectral type

Question 8

Which is brighter in our sky, a star with apparent magnitude 2 or a star with apparent magnitude 7?

Accepted Answer

A star with apparent magnitude

Question 9

To calculate the masses of stars in a binary system, we must measure their ________.

Accepted Answer

A)  orbital period and average orbital distance 
B)  spectral types and distance from Earth 
C)  absolute magnitudes and luminosities 
D)  luminosities and distance from Earth 
A)  orbital period and average orbital distance 
B)  spectral types and distance from Earth 
C)  absolute magnitudes and luminosities 
D)  luminosities and distance from Earth

Explain why stars displaying spectral lines of molecules must be relatively cool.

The most distant stars we can measure stellar parallax for are approximately

Which o the following stars are brightest at ultraviolet wavelengths?

The faintest star visible to the naked eye has an apparent magnitude of about

A star with an apparent magnitude of 10 appears fainter than a star with an apparent magnitude of 9.

Astronomers can measure a star's mass in only certain cases. Which one of the following cases might allow astronomers to measure a star's mass?

You observe a star and you want to plot it on an H-R diagram. You will need to measure all of the following, except the star's ________.

Which is brighter in our sky, a star with apparent magnitude 2 or a star with apparent magnitude 7?

To calculate the masses of stars in a binary system, we must measure their ________.

Our Place in the Universe

Discovering the Universe for Yourself

The Science of Astronomy

Making Sense of the Universe: Understanding Motion, Energy, and Gravity

Light: the Cosmic Messenger

Formation of Planetary Systems: Our Solar System and Beyond

Earth and the Terrestrial Worlds

Jovian Planet Systems

Asteroids, Comets, and Dwarf Planets: Their Nature, Orbits, and Impacts

Our Star

Star Stuff

Bizarre Stellar Graveyard

Our Galaxy

Galaxies and the Foundation of Modern Cosmology

Dark Matter, Dark Energy, and the Fate of the Universe

The Beginning of Time

Life in the Universe

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Exam 11: Surveying the Stars

Explain why stars displaying spectral lines of molecules must be relatively cool.

The most distant stars we can measure stellar parallax for are approximately

Which o the following stars are brightest at ultraviolet wavelengths?

The faintest star visible to the naked eye has an apparent magnitude of about

A star with an apparent magnitude of 10 appears fainter than a star with an apparent magnitude of 9.

Astronomers can measure a star's mass in only certain cases. Which one of the following cases might allow astronomers to measure a star's mass?

You observe a star and you want to plot it on an H-R diagram. You will need to measure all of the following, except the star's ________.

Which is brighter in our sky, a star with apparent magnitude 2 or a star with apparent magnitude 7?

To calculate the masses of stars in a binary system, we must measure their ________.

Our Place in the Universe

Discovering the Universe for Yourself

The Science of Astronomy

Making Sense of the Universe: Understanding Motion, Energy, and Gravity

Light: the Cosmic Messenger

Formation of Planetary Systems: Our Solar System and Beyond

Earth and the Terrestrial Worlds

Jovian Planet Systems

Asteroids, Comets, and Dwarf Planets: Their Nature, Orbits, and Impacts

Our Star

Star Stuff

Bizarre Stellar Graveyard

Our Galaxy

Galaxies and the Foundation of Modern Cosmology

Dark Matter, Dark Energy, and the Fate of the Universe

The Beginning of Time

Life in the Universe

Filters