ISP 205 Final Exam 2024/2025 Exam
Questions and Corresponding Answers
with Surety of 100% Pass Mark
Why do virtually all the galaxies in the universe appear to be moving away
from our own? - 🧠ANSWER ✔✔because expansion causes all galaxies to
move away from nearly all others.
Which of these galaxies is most likely to be oldest? - 🧠ANSWER ✔✔a
galaxy in the Local Group
When we observe a distant galaxy whose photons have traveled for 10
billion years before reaching Earth, we are seeing that galaxy as it was
when the universe was - 🧠ANSWER ✔✔4 billion years old.
Which of these items is a key assumption in our most successful models
for galaxy formation? - 🧠ANSWER ✔✔Some regions of the universe were
slightly denser than others.
In a photo like the Hubble eXtreme Deep Field (the figure in your textbook),
we see galaxies in many different stages of their lives. In general, which
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,galaxies are seen in the earliest (youngest) stages of their lives? -
🧠ANSWER ✔✔the galaxies that are farthest away
The most basic difference between elliptical galaxies and spiral galaxies is
that ________. - 🧠ANSWER ✔✔elliptical galaxies lack anything resembling
the disk of a spiral galaxy
Which of the following is not one of the three major categories of galaxies?
- 🧠ANSWER ✔✔globular galaxies
Suppose that we look at a photograph of many galaxies. Assuming that all
galaxies formed at about the same time, which galaxy in the picture is the
youngest? - 🧠ANSWER ✔✔the one that is farthest away
Which of the following types of galaxies have a disk and spheroidal
component but lack spiral arms? - 🧠ANSWER ✔✔lenticulars
Which of the following types of galaxies appear reddest in color? -
🧠ANSWER ✔✔ellipticals
Which types of galaxies have a clearly defined spheroidal component? -
🧠ANSWER ✔✔lenticulars
ellipticals
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, spirals
Which types of galaxies have a clearly defined disk component? -
🧠ANSWER ✔✔spirals and lenticulars
Compared to spiral galaxies, elliptical galaxies are - 🧠ANSWER ✔✔redder
and more round.
The disk component of a spiral galaxy includes which of the following
parts? - 🧠ANSWER ✔✔spiral arms
What is the major difference between an elliptical galaxy and a spiral
galaxy? - 🧠ANSWER ✔✔An elliptical galaxy lacks a disk component.
Why do spiral galaxies appear blue in color? - 🧠ANSWER ✔✔Their light
output is dominated by hot, massive blue stars.
Why do elliptical galaxies appear yellow or red in color? - 🧠ANSWER
✔✔They have very little dust or cool gas, and thus have little ongoing star
formation.
They contain no hot, young blue stars
Their population is dominated by old, cooler stars.
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STATEMENT. ALL RIGHTS RESERVED
Questions and Corresponding Answers
with Surety of 100% Pass Mark
Why do virtually all the galaxies in the universe appear to be moving away
from our own? - 🧠ANSWER ✔✔because expansion causes all galaxies to
move away from nearly all others.
Which of these galaxies is most likely to be oldest? - 🧠ANSWER ✔✔a
galaxy in the Local Group
When we observe a distant galaxy whose photons have traveled for 10
billion years before reaching Earth, we are seeing that galaxy as it was
when the universe was - 🧠ANSWER ✔✔4 billion years old.
Which of these items is a key assumption in our most successful models
for galaxy formation? - 🧠ANSWER ✔✔Some regions of the universe were
slightly denser than others.
In a photo like the Hubble eXtreme Deep Field (the figure in your textbook),
we see galaxies in many different stages of their lives. In general, which
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
1
STATEMENT. ALL RIGHTS RESERVED
,galaxies are seen in the earliest (youngest) stages of their lives? -
🧠ANSWER ✔✔the galaxies that are farthest away
The most basic difference between elliptical galaxies and spiral galaxies is
that ________. - 🧠ANSWER ✔✔elliptical galaxies lack anything resembling
the disk of a spiral galaxy
Which of the following is not one of the three major categories of galaxies?
- 🧠ANSWER ✔✔globular galaxies
Suppose that we look at a photograph of many galaxies. Assuming that all
galaxies formed at about the same time, which galaxy in the picture is the
youngest? - 🧠ANSWER ✔✔the one that is farthest away
Which of the following types of galaxies have a disk and spheroidal
component but lack spiral arms? - 🧠ANSWER ✔✔lenticulars
Which of the following types of galaxies appear reddest in color? -
🧠ANSWER ✔✔ellipticals
Which types of galaxies have a clearly defined spheroidal component? -
🧠ANSWER ✔✔lenticulars
ellipticals
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STATEMENT. ALL RIGHTS RESERVED
, spirals
Which types of galaxies have a clearly defined disk component? -
🧠ANSWER ✔✔spirals and lenticulars
Compared to spiral galaxies, elliptical galaxies are - 🧠ANSWER ✔✔redder
and more round.
The disk component of a spiral galaxy includes which of the following
parts? - 🧠ANSWER ✔✔spiral arms
What is the major difference between an elliptical galaxy and a spiral
galaxy? - 🧠ANSWER ✔✔An elliptical galaxy lacks a disk component.
Why do spiral galaxies appear blue in color? - 🧠ANSWER ✔✔Their light
output is dominated by hot, massive blue stars.
Why do elliptical galaxies appear yellow or red in color? - 🧠ANSWER
✔✔They have very little dust or cool gas, and thus have little ongoing star
formation.
They contain no hot, young blue stars
Their population is dominated by old, cooler stars.
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
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STATEMENT. ALL RIGHTS RESERVED
