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Exam 3 Review
Exam 3 Review
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1
The evidence that Venus once had water on its surface is given by:
volcanic activity
large quantity of water vapor in its atmosphere today
high percentage of deuterium in the atmosphere
dry riverbeds
2
Life on Jupiter seems unlikely because Jupiter
doesn't have the chemistry for life
has many moons
has a turbulent atmosphere
doesn't have liquid water
3
Which of the following provides evidence for a liquid ocean on Europa?
spectroscopic measurements
magnetic field evidence shows flow of current in liquid layer (salt water?)
all of these
relatively few craters on the icy surface
4
Enceladus (moon of Saturn) was not considered to be a good place to search for life because:
calculations of tidal heating would not provide enough energy
it is small
it is far out in the solar system
all of these
5
We define the habitable zone around a star as where
runaway greenhouse effect could occur
liquid water could exist on the surface
atmospheric losses are least
oxygen is available during formation
6
What is a flyby mission?
Satellites around our planet
Passes by many planets
Orbits a single planet
Orbits many planets
7
In choosing the locations of the inner and outer boundary of the habitability zone, the most important factor is
planetary size
density
greenhouse effect
solar absorption rate
8
The Jovian Nebula that formed the large moons of Jupiter was similar to the solar nebula that formed the planets in that
all of these
it was all spinning in the same direction
it formed in a disk shape
it was hotter in the middle than on the outside
9
Habitability of Earth will someday end. This end must be determined by
giant impacts
war
the death of the sun
contamination from space
10
Which of the following is NOT an environmental requirement for habitability?
A liquid medium for transporting the molecules of life
An orbit around the sun so that it is a planet, not a moon
A source of energy for metabolism
A source of elements and molecules from which to build living cells
11
Runaway Greenhouse Effect works by allowing ____ to enter the atmosphere, rising the temperature which allows more _____
CO2,CO2
water,methane
CO2, water
water, water
12
In examining the habitability of Saturn's moon Titan, atmospheres and oceans remain a problem because:
Titan does not have an atmosphere
Titan's liquid is not water
We haven't been able to examine it due to it's atmosphere
Titan does not have an ocean (or other liquid bodies.)
13
Which of the following features has not been observed on the surface of Mars?
Volcanoes
Erosion features
Ice-caps
Fossils
14
Most moons orbit their planets such that one face is always toward the planet. This situation is called:
Tidal Estuary
Differentiation
Synchronous Rotation
Tidal Energy
15
On Mars, the deep canyon of Valles Marineris and the lifted Tharsis Rise together support the idea that
erosion occurs
CO2 was initially present in the atmosphere
seasons are more extreme on Mars
plate tectonics may have gotten started
16
The current Mars atmosphere has much less CO2 than likely was there in the past. It has probably been lost by
shock waves from impacts
solar wind stripping
being dissolved in the liquid water that was once on the surface
a combination of all of the above
17
There is no stable liquid water on the surface of Mars today because
the temperature is always too cold
the atmospheric pressure is too low
the temperature is always too warm
the atmospheric pressure is too high
18
Over time, the habitability zone for the sun will
get larger and more distant from the sun
get smaller and closer to the sun
get smaller and more distant from the sun
get larger and closer to the sun
19
Which of the following could still be habitable, even though it is outside the habitability zone?
All of these
Free-floating "Earths"
Worlds with pockets of sub-surface water
Worlds with liquids other than water on the surface
20
Percival Lowell was famous for
claiming to see an atmosphere for Mars
discovering the rings of Saturn
mapping the canals of Mars
first observing Jupiter's red spot
21
Which of the following solvents have been considered as possibly supporting life?
Water
All of these
Methane
Ethane
22
Habitability on Earth will someday end. Which of the following problems will likely happen FIRST?
Moist greenhouse effect
Death of the sun
Death of the universe
Runaway greenhouse effect
23
Small moons, asteroids and comets have many problems that make them poor choices in the search for life which is NOT one
Lack of an internal source of energy
Small size
Difficulty in exploration
Lack of atmospheres and oceans
24
The surface temp of Venus is much warmer than that of Earth and the surface temp of Mars is much colder. This is because
The size of the planet. The larger the planet, the warmer it is
Decreasing percentages of CO2 in the atmosphere
The strength of the greenhouse effect
The shape of the orbit around the sun
25
If Earth were moved to the location of Venus, the long-term outcome would be:
sulfuric acid would form in the atmosphere
water levels would remain constant
the temperature would only rise slightly
runaway greenhouse effect would evaporate the oceans
26
What is the limiting factor of the total biomass that could live on Europa?
atmosphere
energy for metabolism
elements and molecules to form life
liquid oceans
27
Recent surface photos of Mars taken by Mars Global Surveyor in 2001 and 2005 show a changed feature that proves that
plate tectonics exist
alien life is present
liquid water exists underground
Mars is volcanically active
28
Life on Europa may have gotten started
in hot springs on the surface
in deep sea vents
in the near-surface tide pools
in the atmosphere
29
Water could exist on Mars
as a permafrost layer
all of these
as underground rivers/lakes
in the polar caps
30
Which of the following pieces of evidence from ALH84001 supports the theory of life on Mars?
All of these
Layering of minerals
Rod-shaped structures
Evidence of having been in water
31
A day on Mars is similar to a day on Earth in that:
storms occur with about the same frequency
the temperature variation is about the same
the sun gives about the same radiant energy to the surface
it is about the same length of time
32
If life exists in very cold environments, what problem will it experience?
Slower mutation rate (evolution rate)
Slower reproduction rate
All of these
Slower metabolism
33
Recent exploration of Titan has shown that its surface is marked by rivers of _______ eroding a surface made of _______.
methane/ethane, water ice
ethane, silicates
water, silicates
water, methane ice
34
The amount of CO2 on Venus and Earth
is the same, just in different locations and forms
is drastically different because of plate tectonics
is drastically different because of man-caused global warming
is drastically different because of solar system location
35
The general result of the Viking experiments carried out on Mars was:
no life was found, but numerous organic compounds suggest life in the past
martians were found
microbial life was found
no clear-cut evidence for life was found
36
Neptune is not a good place to search for life because
it lacks oceans
it does not have an atmosphere
it does not have energy
it would be too difficult to explore its core region where life might exist
37
Terraforming Mars
is simple and inexpensive
would make the planet larger
is impossible
could make the planet habitable for humans in the future
38
Current exploration of Mars includes all of the following EXCEPT:
Orbiters (Mars Express, Mars Odyssey, Mars Reconnaissance, MAVEN)
Scientific experiments (Mars Science Laboratory)
Manned exploration (NASA scientists on the surface)
Rovers (Opportunity and Curiosity)
39
For photosynthesis to be an effective source of energy on a more distant planet from the sun, the life would have to
have a lower metabolic rate
have a larger surface area to collect the sunlight
be more efficient at collecting sunlight energy
all of these or any one in sufficient amounts
40
Which of the following worlds have been explored by human beings and have had samples returned for study?
Mars
Halley's Comet
Venus
The Moon
41
Which of the following water features is NOT currently found on Mars?
dry river drainage systems
oceans
erosion in craters
recent water flow evidence in craters
42
Water's characteristic that it expands when frozen is useful to life in that:
It has a high surface tension allowing droplets to form
A large amount of energy is required to melt 1 gram of ice
Ice floats allowing lower layers of oceans to remain liquid
Expansion during freezing breaks cell walls and membranes
43
In any exploration of a world, we worry about contamination. Which of the following is a problem?
We might become contaminated by alien "germs" or other life from that world
We might accidentally take microbial life from Earth to that world
All of these
We might accidentally kill life on that world by exposure to Earth microbes
44
One of the benefits of water is that it is a polar molecule. This is a useful property for life because
it dissolves many compounds easily
it can block UV radiation from the sun
it requires a large amount of heat energy to evaporate
water expands when frozen
45
The likelihood of finding life on any given world is generally limited by the availability of
a suitable star
a source of energy
atmospheres and oceans
the elements necessary to form life
46
The difference between a lander and a probe is that
probes are designed to explore atmospheres
landers explore solid surfaces
probes might become landers if they survive impact
all of these
47
Jupiter's moons Io, Europa, and Ganymede orbit in a condition called Orbital Resonance. This causes
the moons to spin much faster on their axes
all of these
the magnetic field of Jupiter to heat them
increased internal energy from tidal heating
48
Listed in order of most likely to be habitable to least likely:
Miranda, Ganymede, Europa
Europa, Titan, Earth's Moon
Earth's Moon, Titan, Ganymede
Titan, Callisto, Europa
49
Which of the following determines if a planet will have surface liquid water and therefore be habitable?
all of these
size of the planet
size of the star
distance of the planet to the star
