SCIN261 quiz 4
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School
American Public University *
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Course
261
Subject
Astronomy
Date
Apr 3, 2024
Type
Pages
6
Uploaded by 32denny
Quiz 4 (Weeks 7 & 8) - Results
Attempt 1 of 1
Written Jan 23, 2024 11:51 AM - Jan 23, 2024 12:04 PM
Attempt Score
90 / 100 - 90 %
Overall Grade (Highest Attempt)
90 / 100 - 90 %
Question 1
10 / 10 points
The Drake equation attempts to predict the
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Question 2
10 / 10 points
Which of the following best describes the material which makes up the nucleus of a
comet?
number of intelligent civilizations in the universe.
number of inhabitable planets around stars in our Galaxy.
number of technologically advanced civilizations in our Galaxy.
probability that primitive life exists elsewhere in our Galaxy.
The Drake equation attempts to predict the number of technologically advanced
civilizations that might exist in our Galaxy.
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Question 3
10 / 10 points
The tail of a comet
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Question 4
10 / 10 points
At present time, the most promising destination for future missions looking for current
life elsewhere in our solar system beyond Earth is
Gaseous.
Dirty ice.
Metallic crystals.
Rocky.
A comet's nucleus is like a dirty snowball made of ice.
is gas and dust pulled off the comet by the Sun's gravity.
always points away from the Sun.
trails behind the comet, pointing away from the Sun as the comet approaches it,
and toward the Sun as the comet moves out of the inner Solar System.
is gas and dust expelled from the comet's nucleus and blown outward by radiation
pressure and the solar wind.
both (b) and (d).
The solar wind dislodges gas and dust from the comet and forces the material into
very narrow (relative to their length) tails. The tails always point away from the sun.
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Question 5
10 / 10 points
Scientists are now targeting Europa, one of Jupiter's moons, as a likely site to search
for elementary life forms because
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Question 6
0 / 10 points
Why is liquid water believed to be essential to the development of life?
the Moon.
Europa.
Io.
Mercury.
There is plenty of liquid water in Europa.
there is strong evidence for liquid water beneath the thick ice layer on its surface.
there appears to be large amounts of dark organic material spread on its surface.
radio signals that follow a recognizable pattern have been detected from this
moon.
changes have been seen in the dark lines crossing the icy surface which have a
spectral signature of vegetation.
Beneath Europa's icy crust lies a liquid ocean with more water than Earth contains.
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Question 7
10 / 10 points
Which object in the Asteroid Belt is now classed as a Dwarf Planet?
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Question 8
10 / 10 points
Trans-Neptunian objects are typically located
It provides an electrically conducting medium.
Without water there would be no shoreline.
It combines chemically with other compounds to form the building blocks of life.
It provides an efficient way to transfer substances from a cell to the cell's
environment.
Because it flows and is a universal solvent, liquid water provides an efficient way to
transfer substances from a cell to the cell's environment.
Pluto.
Eris.
Pallas.
Ceres.
Ceres is the largest object in the asteroid belt. It was considered and asteroid (1 Ceres)
but reclassified as a Dwarf Planet in 2006.
near the Jovian planets.
within the Kuiper belt.
within the asteroid belt.
beyond the Oort cloud.
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Question 9
10 / 10 points
Short-period (or Jupiter-family) comets orbit the Sun in fewer than 20 years and come
from
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Question 10
10 / 10 points
Asteroids are mainly made from what?
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Done
Trans-Neptunian objects are typically located within the Kuiper belt, but the scattered
disk contains some of them (e.g. Eris)
the Oort Cloud.
the main Asteroid belt.
the galactic center.
the Kuiper belt.
Jupiter-family comets come from the Kuiper Belt.
Ice and Gas.
Metal and Ice.
Rock and/or Metal.
Rock and Ice.
Asteroids are composed of rock, metal, or a combination of both.
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