Astro 7N Exam 2 Sample Questions and
Answers Graded A+
A high luminosity star... - Correct answer-emits more light than a low luminosity
star
If a red giant appears the same brightness as a red main sequence star, which one is
further away? - Correct answer-the red giant
The heaviest nuclei of all are formed - Correct answer-during a supernova
explosion
Hydrogen-2+proton=________+energy - Correct answer-Helium-3
Which has the smallest radius? - Correct answer-neutron star
Why does the main sequence part of a star's life end? - Correct answer-the
hydrogen in the core is exhausted
Which will have the shortest lifetime on the main sequence? - Correct answer-main
sequence star with surface temperature of 20,000K
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, Many of the 100 brightest stars viewed from Earth are not on the main sequence
(even though most stars are) because... - Correct answer-the most luminous stars
are giants and supergiants that have already finished their main sequence lifetimes
A 2-solar-mass main sequence star is at the same distance as a .2-solar-mass main
sequence star. Which star appears brighter? - Correct answer-the 2 solar mass star
appears brighter
The temperature of the photosphere of the sun is closest to... - Correct answer-
6,000K
An estimate of the number of communicating/technological civilizations that we
expect in our Galaxy would have a larger number if... - Correct answer-the average
number of planets that could support life for each star were larger
If the Sun had twice its mass, which of the planets would be in its habitable zone? -
Correct answer-Jupiter
What is the exoplanet's orbital period, and the percent brightness drop in light, for
the case in the image above? - Correct answer-5 days and 0.30%
How do astronomers measure the temperature of stars? - Correct answer-by
looking at which absorption lines are present in the star's spectrum
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Answers Graded A+
A high luminosity star... - Correct answer-emits more light than a low luminosity
star
If a red giant appears the same brightness as a red main sequence star, which one is
further away? - Correct answer-the red giant
The heaviest nuclei of all are formed - Correct answer-during a supernova
explosion
Hydrogen-2+proton=________+energy - Correct answer-Helium-3
Which has the smallest radius? - Correct answer-neutron star
Why does the main sequence part of a star's life end? - Correct answer-the
hydrogen in the core is exhausted
Which will have the shortest lifetime on the main sequence? - Correct answer-main
sequence star with surface temperature of 20,000K
©COPYRIGHT 2026, ALL RIGHTS RESERVED 1
, Many of the 100 brightest stars viewed from Earth are not on the main sequence
(even though most stars are) because... - Correct answer-the most luminous stars
are giants and supergiants that have already finished their main sequence lifetimes
A 2-solar-mass main sequence star is at the same distance as a .2-solar-mass main
sequence star. Which star appears brighter? - Correct answer-the 2 solar mass star
appears brighter
The temperature of the photosphere of the sun is closest to... - Correct answer-
6,000K
An estimate of the number of communicating/technological civilizations that we
expect in our Galaxy would have a larger number if... - Correct answer-the average
number of planets that could support life for each star were larger
If the Sun had twice its mass, which of the planets would be in its habitable zone? -
Correct answer-Jupiter
What is the exoplanet's orbital period, and the percent brightness drop in light, for
the case in the image above? - Correct answer-5 days and 0.30%
How do astronomers measure the temperature of stars? - Correct answer-by
looking at which absorption lines are present in the star's spectrum
©COPYRIGHT 2026, ALL RIGHTS RESERVED 2
