36 Questions | Total Attempts: 213
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A Lagrange point in the Earth-Moon system is a position
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On the Earth's surface that the Moon's gravity is concentrated
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on the surface of the Moon that points directly away from the Earth
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In space where the effects of the Earth's and Moon's gravity cancel each other out
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Directly between the Earth and Moon
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An optical SETI signal would most likely consist of
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Using mirrors to reflect light from the surface of a planet
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using a giant disk to block out the light from the parent star
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A continuous beam of laser light
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rapid, short bursts of intense laser light
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An organism with an Encephalization Quotient (EQ) of 4 is expected to be of
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Lowest possible intelligence
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Any reply to a detected SETI signal should
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Represent a consensus of the Earth's population
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Be decided upon by the group of scientists who first detected the signal
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Be decided upon by the government of the country who first detected the signal
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Be sent immediately as a signal is received
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If we were to intercept a signal from a civilization that was sent to another of its colonies on the other side of the galaxy, this would be an example of
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an intentional signal beacon
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A signal used for communication between a civilization's home world and another planet in its own planetary system
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A signal used for communication between a civilization's home world and another star system
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a signal used for local communication the world where the intelligent beings exist
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In 1974 we transmitted a message toward the globular cluster M13 which is 21,000 ly away. What is one reason that this object was probably not ideal for sending a message to?
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it is so far away that we will probably have stopped communicating before we receive and return signal
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The message will be absorbed by interstellar dust before it reaches the cluster
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Globular clusters contain, old, low mass stars with fewer heavy elements and hence are not ideal places for life
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Globular clusters contain young, high mass stars with insufficiently long main sequence lifetimes and hence are unsuitable places for life
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Intelligence may be subject to convergent evolution because it
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Is a fundamental characteristic of life
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Sending signals at optical wavelengths might be a viable alternative to radio wavelengths
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over relatively short distances where absorption by interstellar matter would not be a problem
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over all distances as long as the intensity of the signal is strong enough
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Only between civilizations around solar-type stars whose eyes have evolved to see such radiation
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As long as the light transmitted is a different color than the light given off by the parent star
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The 1420 MHz (21 cm) radio line generated by neutral hydrogen atoms is a good choice for interstellar communications because
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it is the easiest radio frequency to generate
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it is the only frequency to which radio telescopes can be tuned
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all intelligent civilizations should be aware of its universal significance and would probably also think of sending and receiving signals at this frequency
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It is the only radio frequency that is not blocked by interstellar matter
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The adoption of very similar streamlined body shapes by both sharks and dolphins provides evidence for
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Life originating in the oceans
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The Declaration of Principles Concerning Activities Following the Detection of Extraterrestrial Intelligence states that the first thing to do after the detection of a possible signal is to
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Announce the discovery to the public
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Confirm that it is genuine
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The Drake equation allows us to estimate the number of
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intelligent civilizations that have existed in our galaxy during its entire lifetime
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intelligent civilizations capable of communicating in our galaxy now
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Intelligent civilizations capable of traveling to the Earth
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Habitable planets on which life has arisen
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The fact that Encephalization Quotients (EQs) of organisms have generally increased with time provides evidence for
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Convergent evolution toward increasing intelligence
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Cross-breeding between organisms
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The fundamental principles of radio SETI were first discussed in a seminal 1959 paper by
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The organisms with the highest Encephalization Quotient (EQ) ratios are
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The ratio of an organism's brain weight to body weight is thought to be roughly proportional to its
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The search for radio signals from intelligent civilizations on planets around nearby solar-type stars is an example of a
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What do we know for certain about the various factors in the Drake equations?
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That none of them can equal 0
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That at least one of them must equal 1
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That at least one of them must equal 0
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That none of them can equal 1
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What kind of civilization can life on Earth currently be classified as?
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What type of civilization would be able to use all the energy around its parent star to capture its radiation?
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Which factor in the modified Drake equation are we best able to estimate?
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Nhp, the number of habitable planets in our galaxy
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fciv, fraction of life-bearing planets where intelligent civilizations have at some time arisen
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Flife, fraction of life-bearing habitable planets which are intelligent now
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fnow, fraction of civilization-bearing planets that have intelligent civilizations on them now
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Which of the following kinds of signal do we currently have the best chance of detecting with currently technology?
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A signal used for communication between a civilization's home world and another star system
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A signal used for communication between a civilization's home world and another planet in its own planetary system
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an intentional signal beacon
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A signal used for local communication in the world where the intelligent beings exist
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Which of the following signals from an advanced civilization would be easiest to detect?
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Small amplitude, wide bandwidth
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Large amplitude, narrow bandwidth
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Small amplitude, narrow bandwidth
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Large amplitude, wide bandwidth
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Which type of electromagnetic radiation is able to carry the most information?
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All types have equal ability
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Which type of signal could carry the largest amount of information?
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