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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