Question 1

Why is the main sequence main? Why are these stars so common?

Accepted Answer

While their masses, luminosities, and te

Question 2

If a star has a parallax of 0.05", then its distance in light-years is about

Accepted Answer

A)  6.4 light-years. 
B)  12.7 light-years. 
C)  20 light-years. 
D)  65 light-years. 
E)  100 light-years. 
A)  6.4 light-years. 
B)  12.7 light-years. 
C)  20 light-years. 
D)  65 light-years. 
E)  100 light-years.

Question 3

Star A and star B both have an apparent magnitude of 7.0, but star A is at a distance of 15 pc and star B is at a distance of 30 pc. Which statement below is correct?

Accepted Answer

A)  Star A appears brighter than star B, but star B and star A have the same intrinsic brightness. 
B)  Star B appears brighter than star A, but star B and star A have the same intrinsic brightness. 
C)  Star A and star B appear to have the same brightness, but star B is intrinsically brighter than star A. 
D)  Star A and star B appear to have the same brightness, but star A is intrinsically brighter than star B. 
E)  It is impossible to determine how bright these stars are or appear to be relative to one another, given the information above. 
A)  Star A appears brighter than star B, but star B and star A have the same intrinsic brightness. 
B)  Star B appears brighter than star A, but star B and star A have the same intrinsic brightness. 
C)  Star A and star B appear to have the same brightness, but star B is intrinsically brighter than star A. 
D)  Star A and star B appear to have the same brightness, but star A is intrinsically brighter than star B. 
E)  It is impossible to determine how bright these stars are or appear to be relative to one another, given the information above.

Question 4

In a spectroscopic binary, the star whose lines shift the most weighs the most.

Accepted Answer

A) True 
 B)False

Question 5

If a star is found by spectroscopic observations to be about 500 parsecs distant, its parallax is

Accepted Answer

A)  0.2". 
B)  0.5". 
C)  0.02". 
D)  0.002". 
E)  0.005". 
A)  0.2". 
B)  0.5". 
C)  0.02". 
D)  0.002". 
E)  0.005".

Question 6

On the H-R diagram, most bright naked eye stars would lie at the ________.

Accepted Answer

The answer of On the H-R diagram, most bright naked...

Why is the main sequence main? Why are these stars so common?

If a star has a parallax of 0.05", then its distance in light-years is about

Star A and star B both have an apparent magnitude of 7.0, but star A is at a distance of 15 pc and star B is at a distance of 30 pc. Which statement below is correct?

In a spectroscopic binary, the star whose lines shift the most weighs the most.

If a star is found by spectroscopic observations to be about 500 parsecs distant, its parallax is

On the H-R diagram, most bright naked eye stars would lie at the ________.

The Night Sky

Light and Telescopes

The Solar System

Earth and Its Moon

The Eight Planets

Small Bodies in the Solar System

Formation of Planetary Systems

The Sun

Star Formation and Evolution

Stellar Explosions

Black Holes

The Milky Way Galaxy

Galaxies

Cosmology and the Universe

Filters

Exam 9: Measuring the Stars

Why is the main sequence main? Why are these stars so common?

If a star has a parallax of 0.05", then its distance in light-years is about

Star A and star B both have an apparent magnitude of 7.0, but star A is at a distance of 15 pc and star B is at a distance of 30 pc. Which statement below is correct?

In a spectroscopic binary, the star whose lines shift the most weighs the most.

If a star is found by spectroscopic observations to be about 500 parsecs distant, its parallax is

On the H-R diagram, most bright naked eye stars would lie at the ________.

The Night Sky

Light and Telescopes

The Solar System

Earth and Its Moon

The Eight Planets

Small Bodies in the Solar System

Formation of Planetary Systems

The Sun

Star Formation and Evolution

Stellar Explosions

Black Holes

The Milky Way Galaxy

Galaxies

Cosmology and the Universe

Filters