SCIN261 quiz 2
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School
American Public University *
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Course
261
Subject
Astronomy
Date
Apr 3, 2024
Type
Pages
5
Uploaded by 32denny
Quiz 2 (Weeks 3 & 4) - Results
Attempt 1 of 1
Written Dec 28, 2023 12:15 PM - Dec 28, 2023 12:34 PM
Attempt Score
90 / 100 - 90 %
Overall Grade (Highest Attempt)
90 / 100 - 90 %
Question 1
10 / 10 points
The high reflectivity of Saturn's rings suggests that they are primarily composed of
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Question 2
10 / 10 points
Venus' atmospheric temperature is
water ice.
methane ice.
silicates.
metal.
Saturn's rings are highly reflective because they are mostly composed of water ice,
which reflects most of the sunlight that falls upon it.
about the same as Earth's.
cooler than temperatures on Mercury.
high due the presence of sulfuric acid.
hotter than temperatures on Mercury.
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Question 3
10 / 10 points
How do astronomers know what the surface of Venus looks like?
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Question 4
0 / 10 points
Mercury solar day is longer than its solar year.
True
False
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The average temperature on Venus is 462 degrees Celsius. The surface temperature of
Mercury is about 430 C.
They've landed space probes on the surface that have studied it for years.
They've bounced radio waves off the surface and measured how the signals
return.
They've measured the variations in energy emitted by the planet and used that to
determine the locations of surface features.
They've observed the surface using the Hubble Space Telescope.
Since Venus is covered with a thick cloud cover, it is impossible to view the surface of
the planet at visible wavelengths. The Soviet Union landed a space probe on the
surface of Venus, but it only survived a few hours before the intense heat and pressure
destroyed it. The way we know what the surface of Venus looks like is by bouncing
radio waves off of its surface and measuring how the signals return.
The time it takes for the Sun to reach the highest point in the sky two consecutive
times on Mercury is 176 Earth days, longer than one year on Mercury (88 Earth days).
A sidereal day on Mercury with respect to the stars is 59 Earth days.
Question 5
10 / 10 points
Scientists believe that liquid water once existed on the surface of Mars. Where did it
go?
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Question 6
10 / 10 points
The main constituent of Jupiter's atmosphere is
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Question 7
10 / 10 points
The Moon has more craters than the Earth because
It still exists on Mars, just not as much.
It exists beneath the surface of Mars, mostly in the polar caps.
It evaporated and completely escaped from Mars' atmosphere.
It evaporated and now exists as clouds of water vapor.
Mars' limited atmosphere is too thin to exert enough pressure on the surface of Mars
for water to exist in liquid form. Today, scientists believe that water on Mars lies
beneath the surface of the planet, mostly near the polar ice caps.
helium.
ammonia.
hydrogen.
carbon dioxide.
The most abundant gas in Jupiter's atmosphere is molecular hydrogen, followed by
helium.
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Question 8
10 / 10 points
Why do Uranus and Neptune appear bluish in color?
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Question 9
10 / 10 points
Jupiter emits more energy than it receives from the Sun.
the Moon is older than the Earth.
the Moon shields the Earth from getting hit as often.
Earth's gravity alters the path of impactors, causing them to collide with the Moon.
geologic and meteorological processes have removed evidence of impacts on
Earth.
Earth has relatively few impact craters because most of them have been erased over
time due to geologic and meteorological processes. Weather has eroded the surface of
the Earth, and tectonic motion of the plates has buried others.
The ices in their atmospheres appear bluish upon reflection of sunlight.
The presence of water vapor in their atmospheres causes them to appear blue, just
like oceans on Earth.
The presence of oxygen and nitrogen in their atmospheres scatters blue light just
like Earth's sky.
The presence of methane in their atmospheres absorbs red light and only reflects
blue light.
Both Uranus' and Neptune's atmospheres contain small amounts (roughly 3%) of
methane. When white light shines on methane, methane absorbs the longer
wavelengths of light (red, orange, and yellow) and reflects the rest. This gives Uranus
and Neptune their characteristic bluish color.
True
False
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Question 10
10 / 10 points
The fact that Jupiter and Saturn have densities near 1000 kg/m3 suggests that they
are composed mostly of
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Done
Jupiter emits about twice as much energy as reaches the planet in the form of
sunlight.
water.
hydrogen and helium.
iron.
silicate rock.
Jupiter and Saturn have such low gravities because they are mostly composed of
hydrogen and helium, the two lightest elements.