ASTR 100 Spring 2025 All Quizzes Questions and Answers Latest Update 2025/2026
Which of these numbers is larger and by approximately how many times?
a) 2.1 x 106 or 2.2 x 104
b) 2.1 x 106 by 2 times
c) 2.1 x 106 by 100 times
d) 2.2 x 104 by 2 times
e) 2.2 x 104 by 100 times - Answers c) 2.1 x 106 by 100 times
Proxima Centauri is:
a) the closest star to the Sun
b) Part of the Milky Way galaxy
c) Part of the same galaxy cluster as our Sun
d) More than 1 light year away
e) all of the above - Answers e) All of the Above
Uranus is 20 AU from the Sun. Uranus is ____________ times farther from the Sun than the Earth
is.
a) 5
b) 10
c) 20
d) 30
e) Impossible to tell with information given. - Answers c) 20
Which of these objects is the smallest?
a) Supercluster
b) Galaxy
c) Cluster
d) Sun
e) Solar System - Answers d) Sun
,Which of these is true about the scientific method?
a) The scientific method ends after astronomers test a hypothesis two times.
b) An idea that is impossible to test can be considered a scientific theory.
c) The scientific method for astronomy has to mostly use observations instead of experiments
in a lab to test hypotheses.
d) When astronomers call something a theory, they mean it is an idea that hasn't really been
tested.
e) All of the above - Answers c) The scientific method for astronomy has to mostly use
observations instead of experiments in a lab to test hypotheses.
Which of these descriptions is correct?
a) Galaxy = Group of stars, gas, and dust
b) Cluster = Group of galaxies
c) Supercluster = Group of clusters
d) All of the above - Answers d) All of the above
Our solar system is made up of the Sun and:
a) Only the 8 planets.
b) Anything larger than Pluto.
c) Anything that orbits the Sun.
d) All the other stars in our galaxy. - Answers c) Anything that orbits the Sun.
Which of these statements is true?
a) The closest natural object in space to the Earth is the Sun.
b) Occam's Razor says that we should always choose the most complicated explanation for a
hypothesis.
c) All the stars that we can see with the naked eye are in our solar system.
d) Most of the atoms in our body have passed through (and in many cases formed) in stars.
e) According to the cosmological principle, the laws of physics and astronomy are probably
different on Earth compared to a planet in a different galaxy. - Answers d) Most of the atoms in
our body have passed through (and in many cases formed) in stars.
,Which of these parts of our cosmic address is NOT correct?
a) Galaxy = Milky Way
b) Planet = Earth
c) Galaxy Cluster = Virgo Group
d) Galaxy Supercluster = Local Supercluster (also called Virgo or sometimes Laniakea) -
Answers c) Galaxy Cluster = Virgo Group
T/F: Trying to give real-time commands to satellites or probes that are orbiting other planets
can be difficult because of the time it takes radio signals carrying the commands to go from the
Earth to the satellite. - Answers True
Which of the following is true about constellations and asterisms?
a) Anyone can make up a constellation, but asterisms are official shapes approved by
astronomers at meetings.
b) There are a total of 88 constellations.
c) There are large parts of the sky that are not part of any constellation.
d) All the stars in a constellation are the same distance from the Earth.
e) The alpha star of a constellation is always the star closest to Earth. - Answers b) There are a
total of 88 constellations.
The most likely distance to a star in the Big Dipper is:
a) 10 light years
b) 10 AU
c) 10 meters
d) 10 kilometers - Answers a) 10 light years
Imagine a star is 10 light years away. If that star exploded, we would see the explosion:
a) Right away.
b) In 10 minutes.
c) In 10 years.
d) In 10 million years. - Answers c) In 10 years.
, Which of these five objects is the largest?
a) Supercluster
b) Earth
c) Cluster
d) Solar System
e) Sun - Answers a) Supercluster
An astronomical unit is:
a)The best unit for measuring distances in our solar system.
b)Defined as the average distance from the Earth to the Sun. c)Smaller than a light year.
d)All of the above - Answers d)All of the above
T/F: When you are looking at the Sun, you are seeing the Sun as it is at this exact moment. -
Answers False
Which of these statements is true?
a) If the Earth did not orbit the Sun, stars would rise at the same time every day.
b) Leap years are necessary because a year is about 365.24 days and not exactly 365 days.
c) It takes approximately 2 weeks for the moon to go from new moon to full moon.
d) All of the above. - Answers d) All of the above.
Which of these statements is true?
a) Areas near the North Pole are sometimes called the "Land of the Midnight Sun" because the
Sun is in the sky at midnight all year.
b) The name "equinox" is appropriate because everywhere on the Earth night and day are the
same lengths on the equinoxes.
c) It is always cold near the South Pole because the South Pole is at a very high elevation.
d) If you are located in the Tropics then the Sun will be directly overhead every day. - Answers b)
The name "equinox" is appropriate because everywhere on the Earth night and day are the same
lengths on the equinoxes.
Which of these is NOT true about the year and the signs of the zodiac?
Which of these numbers is larger and by approximately how many times?
a) 2.1 x 106 or 2.2 x 104
b) 2.1 x 106 by 2 times
c) 2.1 x 106 by 100 times
d) 2.2 x 104 by 2 times
e) 2.2 x 104 by 100 times - Answers c) 2.1 x 106 by 100 times
Proxima Centauri is:
a) the closest star to the Sun
b) Part of the Milky Way galaxy
c) Part of the same galaxy cluster as our Sun
d) More than 1 light year away
e) all of the above - Answers e) All of the Above
Uranus is 20 AU from the Sun. Uranus is ____________ times farther from the Sun than the Earth
is.
a) 5
b) 10
c) 20
d) 30
e) Impossible to tell with information given. - Answers c) 20
Which of these objects is the smallest?
a) Supercluster
b) Galaxy
c) Cluster
d) Sun
e) Solar System - Answers d) Sun
,Which of these is true about the scientific method?
a) The scientific method ends after astronomers test a hypothesis two times.
b) An idea that is impossible to test can be considered a scientific theory.
c) The scientific method for astronomy has to mostly use observations instead of experiments
in a lab to test hypotheses.
d) When astronomers call something a theory, they mean it is an idea that hasn't really been
tested.
e) All of the above - Answers c) The scientific method for astronomy has to mostly use
observations instead of experiments in a lab to test hypotheses.
Which of these descriptions is correct?
a) Galaxy = Group of stars, gas, and dust
b) Cluster = Group of galaxies
c) Supercluster = Group of clusters
d) All of the above - Answers d) All of the above
Our solar system is made up of the Sun and:
a) Only the 8 planets.
b) Anything larger than Pluto.
c) Anything that orbits the Sun.
d) All the other stars in our galaxy. - Answers c) Anything that orbits the Sun.
Which of these statements is true?
a) The closest natural object in space to the Earth is the Sun.
b) Occam's Razor says that we should always choose the most complicated explanation for a
hypothesis.
c) All the stars that we can see with the naked eye are in our solar system.
d) Most of the atoms in our body have passed through (and in many cases formed) in stars.
e) According to the cosmological principle, the laws of physics and astronomy are probably
different on Earth compared to a planet in a different galaxy. - Answers d) Most of the atoms in
our body have passed through (and in many cases formed) in stars.
,Which of these parts of our cosmic address is NOT correct?
a) Galaxy = Milky Way
b) Planet = Earth
c) Galaxy Cluster = Virgo Group
d) Galaxy Supercluster = Local Supercluster (also called Virgo or sometimes Laniakea) -
Answers c) Galaxy Cluster = Virgo Group
T/F: Trying to give real-time commands to satellites or probes that are orbiting other planets
can be difficult because of the time it takes radio signals carrying the commands to go from the
Earth to the satellite. - Answers True
Which of the following is true about constellations and asterisms?
a) Anyone can make up a constellation, but asterisms are official shapes approved by
astronomers at meetings.
b) There are a total of 88 constellations.
c) There are large parts of the sky that are not part of any constellation.
d) All the stars in a constellation are the same distance from the Earth.
e) The alpha star of a constellation is always the star closest to Earth. - Answers b) There are a
total of 88 constellations.
The most likely distance to a star in the Big Dipper is:
a) 10 light years
b) 10 AU
c) 10 meters
d) 10 kilometers - Answers a) 10 light years
Imagine a star is 10 light years away. If that star exploded, we would see the explosion:
a) Right away.
b) In 10 minutes.
c) In 10 years.
d) In 10 million years. - Answers c) In 10 years.
, Which of these five objects is the largest?
a) Supercluster
b) Earth
c) Cluster
d) Solar System
e) Sun - Answers a) Supercluster
An astronomical unit is:
a)The best unit for measuring distances in our solar system.
b)Defined as the average distance from the Earth to the Sun. c)Smaller than a light year.
d)All of the above - Answers d)All of the above
T/F: When you are looking at the Sun, you are seeing the Sun as it is at this exact moment. -
Answers False
Which of these statements is true?
a) If the Earth did not orbit the Sun, stars would rise at the same time every day.
b) Leap years are necessary because a year is about 365.24 days and not exactly 365 days.
c) It takes approximately 2 weeks for the moon to go from new moon to full moon.
d) All of the above. - Answers d) All of the above.
Which of these statements is true?
a) Areas near the North Pole are sometimes called the "Land of the Midnight Sun" because the
Sun is in the sky at midnight all year.
b) The name "equinox" is appropriate because everywhere on the Earth night and day are the
same lengths on the equinoxes.
c) It is always cold near the South Pole because the South Pole is at a very high elevation.
d) If you are located in the Tropics then the Sun will be directly overhead every day. - Answers b)
The name "equinox" is appropriate because everywhere on the Earth night and day are the same
lengths on the equinoxes.
Which of these is NOT true about the year and the signs of the zodiac?
