Astro 7N Final Exam 2024/2025 Exam
Questions and Corresponding Answers
with Surety of 100% Pass Mark
A high-luminosity star - 🧠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 farther away - 🧠ANSWER ✔✔the red giant
the heaviest nuclei of all are formed - 🧠ANSWER ✔✔during a supernova
explosion
fill in the blank in the following chemical reaction that occurs in the sun -
🧠ANSWER ✔✔hydrogen-2 + proton = helium-3 + energy
which of the following has the smallest radius - 🧠ANSWER ✔✔neutron star
why does the main sequence part of a star's life end? - 🧠ANSWER ✔✔the
hydrogen in the core is exhausted
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
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PRIVACY STATEMENT. ALL RIGHTS RESERVED
, which of the following will have the shortest lifetime on the main sequence?
- 🧠ANSWER ✔✔main sequence star with surface temp of 20000 K
Many of the brightest 100 stars viewed from Earth are not on the main
sequence (even though most stars are) because - 🧠ANSWER ✔✔the most
luminous stars are giants and supergiants that have already finished their
main sequence lifetimes
a 2-solar-mass main sequence stat is at the same distance as a 0.2-solar-
mass main sequence star. Which star appears brighter? - 🧠ANSWER
✔✔the 2 solar mass main sequence star appears brighter
the temp of the photosphere of the sun is closest to - 🧠ANSWER ✔✔6000
K
An estimate of the number of communicating/technological civilizations that
we expect in our galaxy would be a larger number if - 🧠ANSWER ✔✔the
average number of planets that could support life for each star were larger
if the sun had twice its mass, then which of these planets would be in its
habitable zone - 🧠ANSWER ✔✔jupiter
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
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PRIVACY STATEMENT. ALL RIGHTS RESERVED
Questions and Corresponding Answers
with Surety of 100% Pass Mark
A high-luminosity star - 🧠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 farther away - 🧠ANSWER ✔✔the red giant
the heaviest nuclei of all are formed - 🧠ANSWER ✔✔during a supernova
explosion
fill in the blank in the following chemical reaction that occurs in the sun -
🧠ANSWER ✔✔hydrogen-2 + proton = helium-3 + energy
which of the following has the smallest radius - 🧠ANSWER ✔✔neutron star
why does the main sequence part of a star's life end? - 🧠ANSWER ✔✔the
hydrogen in the core is exhausted
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
1
PRIVACY STATEMENT. ALL RIGHTS RESERVED
, which of the following will have the shortest lifetime on the main sequence?
- 🧠ANSWER ✔✔main sequence star with surface temp of 20000 K
Many of the brightest 100 stars viewed from Earth are not on the main
sequence (even though most stars are) because - 🧠ANSWER ✔✔the most
luminous stars are giants and supergiants that have already finished their
main sequence lifetimes
a 2-solar-mass main sequence stat is at the same distance as a 0.2-solar-
mass main sequence star. Which star appears brighter? - 🧠ANSWER
✔✔the 2 solar mass main sequence star appears brighter
the temp of the photosphere of the sun is closest to - 🧠ANSWER ✔✔6000
K
An estimate of the number of communicating/technological civilizations that
we expect in our galaxy would be a larger number if - 🧠ANSWER ✔✔the
average number of planets that could support life for each star were larger
if the sun had twice its mass, then which of these planets would be in its
habitable zone - 🧠ANSWER ✔✔jupiter
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
2
PRIVACY STATEMENT. ALL RIGHTS RESERVED
