ASTRONOMY 1010 FINAL EXAM
2025/2026 NEWEST EXAM
CURRENTLY TESTING
COMPLETE 400 QUESTIONS WITH
DETAILED VERIFIED ANSWERS
EXPERT VERIFIED FOR A+
GRADE
Star X has an apparent magnitude of 3, and star Y has an
apparent magnitude of 8. How do they compare in
observed brightness?
A) Star X is 100 times brighter than star Y.
B) Star X is 5 times brighter than star Y.
C) Star Y is 100 times brighter than star X
D) Star Y is 5 times brighter than star X. -
....ANSWER...A) Star X is 100 times brighter than star Y
Which star has the lowest surface temperature?
,A) Sun, G2 V
B) Sirius, A1V
C) Proxima Centauri, M5.5 V
D) Betelgeuse, M2I - ....ANSWER...C) Proxima centauri,
M5.5 V
Careful measurements reveal that a star maintains a
steady apparent brightness at most times, except that at
precise intervals of 73 hours the star becomes dimmer for
about 2 hours. The change in brightness alternates
between a small change and a large change. The most
likely explanation is that ________.
A) the star is a Cepheid variable
B) the star is a member of an eclipsing binary star system
C) the star is periodically ejecting gas into space every 73
hours
D) the star is a white dwarf - ....ANSWER...B)the star is
a member of an eclipsing binary star system
The star Vega has an absolute magnitude of about 4 and
an apparent magnitude of about 0. Based on the
,definitions of absolute and apparent magnitude, we can
conclude that ________.
A) Vega is nearer than 10 parsecs from Earth
B) Vega's surface temperature is cooler than the Sun
C) Vega's luminosity is less than that of our Sun D) Vega is
farther than 10 parsecs from Earth - ....ANSWER...A)
Vega is nearer than 10 parsecs from Earth
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 ________.
A) distance
C) spectral type
B) apparent brightness
D) mass - ....ANSWER...D) mass
The choices below each describe the appearance of an H-R
diagram for a different star cluster. Which cluster is the
youngest?
A) The diagram shows main-sequence stars of spectral
types G, K, and M, along with numerous giants and white
dwarfs.
, B) The diagram shows no main-sequence stars at all, but it
has numerous supergiants and white dwarfs.
C) The diagram shows main-sequence stars of all the
spectral types except O and B, along with a few
giants and supergiants.
D) The diagram shows main-sequence stars of every
spectral type except O, along with a few giants and
supergiants. - ....ANSWER...D) The diagram shows main-
sequence stars of every spectral type except O, along with
a few giants and supergiants
Why do O stars exhibit weak hydrogen absorption lines?
A) O stars contain very little hydrogen.
B) At these high temperatures, nearly all the hydrogen is
ionized, and is therefore unable to interact with light.
C) O stars are too cool to excite most hydrogen atoms to
the first energy level, from which they can then absorb
visible wavelengths of light. - ....ANSWER...B) At these
high temperature, nearly all the hydrogen is ionized, and is
therefore unable to interact with light
Which two energy sources can help a star maintain its
internal thermal pressure?
2025/2026 NEWEST EXAM
CURRENTLY TESTING
COMPLETE 400 QUESTIONS WITH
DETAILED VERIFIED ANSWERS
EXPERT VERIFIED FOR A+
GRADE
Star X has an apparent magnitude of 3, and star Y has an
apparent magnitude of 8. How do they compare in
observed brightness?
A) Star X is 100 times brighter than star Y.
B) Star X is 5 times brighter than star Y.
C) Star Y is 100 times brighter than star X
D) Star Y is 5 times brighter than star X. -
....ANSWER...A) Star X is 100 times brighter than star Y
Which star has the lowest surface temperature?
,A) Sun, G2 V
B) Sirius, A1V
C) Proxima Centauri, M5.5 V
D) Betelgeuse, M2I - ....ANSWER...C) Proxima centauri,
M5.5 V
Careful measurements reveal that a star maintains a
steady apparent brightness at most times, except that at
precise intervals of 73 hours the star becomes dimmer for
about 2 hours. The change in brightness alternates
between a small change and a large change. The most
likely explanation is that ________.
A) the star is a Cepheid variable
B) the star is a member of an eclipsing binary star system
C) the star is periodically ejecting gas into space every 73
hours
D) the star is a white dwarf - ....ANSWER...B)the star is
a member of an eclipsing binary star system
The star Vega has an absolute magnitude of about 4 and
an apparent magnitude of about 0. Based on the
,definitions of absolute and apparent magnitude, we can
conclude that ________.
A) Vega is nearer than 10 parsecs from Earth
B) Vega's surface temperature is cooler than the Sun
C) Vega's luminosity is less than that of our Sun D) Vega is
farther than 10 parsecs from Earth - ....ANSWER...A)
Vega is nearer than 10 parsecs from Earth
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 ________.
A) distance
C) spectral type
B) apparent brightness
D) mass - ....ANSWER...D) mass
The choices below each describe the appearance of an H-R
diagram for a different star cluster. Which cluster is the
youngest?
A) The diagram shows main-sequence stars of spectral
types G, K, and M, along with numerous giants and white
dwarfs.
, B) The diagram shows no main-sequence stars at all, but it
has numerous supergiants and white dwarfs.
C) The diagram shows main-sequence stars of all the
spectral types except O and B, along with a few
giants and supergiants.
D) The diagram shows main-sequence stars of every
spectral type except O, along with a few giants and
supergiants. - ....ANSWER...D) The diagram shows main-
sequence stars of every spectral type except O, along with
a few giants and supergiants
Why do O stars exhibit weak hydrogen absorption lines?
A) O stars contain very little hydrogen.
B) At these high temperatures, nearly all the hydrogen is
ionized, and is therefore unable to interact with light.
C) O stars are too cool to excite most hydrogen atoms to
the first energy level, from which they can then absorb
visible wavelengths of light. - ....ANSWER...B) At these
high temperature, nearly all the hydrogen is ionized, and is
therefore unable to interact with light
Which two energy sources can help a star maintain its
internal thermal pressure?
