ASTR 1102 final Exam 2025 | Updated Questions
and Correct Answers | Already Graded A+ |
verified Answers | Just Released
What is Astronomy?
A) Fortune-telling based on looking at the positions of stars and planets
B) A law discipline
C) The study of relationship between food and culture
D) A natural science ---------CORRECT ANSWER-----------------D
I am a theoretical astrophysicist. Where do you think I spend most of my time?
A) Looking through a telescope at night
B) Instructing an automated telescope to take digital images for me
C) Working in the office during the night
D) Working in the office during the day ---------CORRECT ANSWER-----------------D
My friend Tabby is an observational astronomer. Where do you think she spends
most of her time?
A) Looking through a telescope at night
B) Instructing telescopes to take digital images for her
C) Working in the office during the night
D) Working in the office during the day ---------CORRECT ANSWER-----------------D
What is the necessary condition for Universe to exist?
,A) A set of natural laws that work together in harmony
B) A living consciousness to study and interpret its laws
C) LSU Football ---------CORRECT ANSWER-----------------A and B
Which star, from the following, in the constellation of Cygnus is brighter?
A) Delta (δ) Cygni
B) Zeta (ζ) Cygni
C) LL Cygni
D) Epsilon (ε) Cygni
E) Theta (θ) Cygni ---------CORRECT ANSWER-----------------A
How many stars are there are in the Milky Way Galaxy
A) None, all stars are outside the Milky Way Galaxy
B) One, the Sun
C) 200
D) 200 million
E) 200 billion ---------CORRECT ANSWER-----------------E
How is the "ecliptic" defined?
A) The apparent path of the moon in the night sky
B) The apparent path of the sun across the celestial sphere going through the 12
"zodiac" constellations
C) The line connecting the brightest stars in the sky
D) It corresponds to the plane of the Milky-Way galaxy ---------CORRECT ANSWER--
---------------B
,When a modern astronomer thinks 'CONSTELLATION', what are they thinking of?
A) A sign of the zodiac
B) A finite volume of space
C) A group of bright stars
D) A region of the visible sky
E) A mythological figure ---------CORRECT ANSWER-----------------D
Which of the following statements about light is NOT true?
A) Radio waves are a kind of light
B) You see events as soon as they happen
C) White light is actually a mix of many different colors
D) Objects that move towards or away from you appear a different color ---------
CORRECT ANSWER-----------------B
Which color of light has the highest frequency?
A) Green
B) Violet
C) Yellow
D) Red
E) Blue ---------CORRECT ANSWER-----------------B
The black-body spectrum of a star peaks at a longer wavelength than that of that
of the sun. The star therefore must be:
A) Hotter than the sun
, B) Cooler than the sun
C) at the same temperature as the sun ---------CORRECT ANSWER-----------------B
The Sun has a lifetime of 10 billion years. If a B star has a mass of 10 M◉ and a
luminosity of 10,000 L◉, how long will it live for?
A) 1 billion years
B) 100 million years
C) 10 million years
D) 1 million years ---------CORRECT ANSWER-----------------C
An A5 star has 5x the mass of the Sun, but 15x the luminosity. How long will it
live?
A) 1/3rd of the Sun's lifetime
B) 1/5th of the Sun's lifetime
C) 3 times the Sun's lifetime ---------CORRECT ANSWER-----------------A
Why is the sun gradually and very slowly get's brighter during its lifetime in the
main-sequence?
A) Because newly made helium in the core of the sun produces more nuclear
energy via fusion during the main-sequence.
B) Because as hydrogen converts to helium in the core, the pressure slowly
decreases and gravity slowly compresses the core making it hotter therefore
producing more luminosity.
and Correct Answers | Already Graded A+ |
verified Answers | Just Released
What is Astronomy?
A) Fortune-telling based on looking at the positions of stars and planets
B) A law discipline
C) The study of relationship between food and culture
D) A natural science ---------CORRECT ANSWER-----------------D
I am a theoretical astrophysicist. Where do you think I spend most of my time?
A) Looking through a telescope at night
B) Instructing an automated telescope to take digital images for me
C) Working in the office during the night
D) Working in the office during the day ---------CORRECT ANSWER-----------------D
My friend Tabby is an observational astronomer. Where do you think she spends
most of her time?
A) Looking through a telescope at night
B) Instructing telescopes to take digital images for her
C) Working in the office during the night
D) Working in the office during the day ---------CORRECT ANSWER-----------------D
What is the necessary condition for Universe to exist?
,A) A set of natural laws that work together in harmony
B) A living consciousness to study and interpret its laws
C) LSU Football ---------CORRECT ANSWER-----------------A and B
Which star, from the following, in the constellation of Cygnus is brighter?
A) Delta (δ) Cygni
B) Zeta (ζ) Cygni
C) LL Cygni
D) Epsilon (ε) Cygni
E) Theta (θ) Cygni ---------CORRECT ANSWER-----------------A
How many stars are there are in the Milky Way Galaxy
A) None, all stars are outside the Milky Way Galaxy
B) One, the Sun
C) 200
D) 200 million
E) 200 billion ---------CORRECT ANSWER-----------------E
How is the "ecliptic" defined?
A) The apparent path of the moon in the night sky
B) The apparent path of the sun across the celestial sphere going through the 12
"zodiac" constellations
C) The line connecting the brightest stars in the sky
D) It corresponds to the plane of the Milky-Way galaxy ---------CORRECT ANSWER--
---------------B
,When a modern astronomer thinks 'CONSTELLATION', what are they thinking of?
A) A sign of the zodiac
B) A finite volume of space
C) A group of bright stars
D) A region of the visible sky
E) A mythological figure ---------CORRECT ANSWER-----------------D
Which of the following statements about light is NOT true?
A) Radio waves are a kind of light
B) You see events as soon as they happen
C) White light is actually a mix of many different colors
D) Objects that move towards or away from you appear a different color ---------
CORRECT ANSWER-----------------B
Which color of light has the highest frequency?
A) Green
B) Violet
C) Yellow
D) Red
E) Blue ---------CORRECT ANSWER-----------------B
The black-body spectrum of a star peaks at a longer wavelength than that of that
of the sun. The star therefore must be:
A) Hotter than the sun
, B) Cooler than the sun
C) at the same temperature as the sun ---------CORRECT ANSWER-----------------B
The Sun has a lifetime of 10 billion years. If a B star has a mass of 10 M◉ and a
luminosity of 10,000 L◉, how long will it live for?
A) 1 billion years
B) 100 million years
C) 10 million years
D) 1 million years ---------CORRECT ANSWER-----------------C
An A5 star has 5x the mass of the Sun, but 15x the luminosity. How long will it
live?
A) 1/3rd of the Sun's lifetime
B) 1/5th of the Sun's lifetime
C) 3 times the Sun's lifetime ---------CORRECT ANSWER-----------------A
Why is the sun gradually and very slowly get's brighter during its lifetime in the
main-sequence?
A) Because newly made helium in the core of the sun produces more nuclear
energy via fusion during the main-sequence.
B) Because as hydrogen converts to helium in the core, the pressure slowly
decreases and gravity slowly compresses the core making it hotter therefore
producing more luminosity.
