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vocab . final
Terms in this set (23)
How is intelligence defined in the Drake Equation?
a civilization willing and able to communicate over interstellar distances
The rare-Earth hypothesis would predict that the factor flife, in the Drake equation should be close to
The organisms with the next highest Encephalization Quotient (EQ) ratios after humans are
The fact that Encephalization Quotients (EQs) of organisms have generally increased with time provides evidence for
convergent evolution toward intelligence
The 1420 MHz (21 cm) radio line generated by neutral hydrogen atoms is a good choice for interstellar communications because
all intelligent civilizations should be aware of its universal significance and would probably also think of sending and receiving signals at this frequency
One of the most likely places an advanced civilization might leave an artifact for us to find would be
the L4 and L5 points in the Earth—Moon system
The Drake equation allows us to estimate the number of
intelligent civilizations capable of communicating in our galaxy now
Suppose there are a million habitable planets in our galaxy, that one in ten are habitable, that one in a thousand planets with life had at some point had an intelligent civilization, and that one in a hundred civilizations that has ever existed is in existence now. Given this, how many civilizations are in existence now?
Which of the following factors in the simplified Drake equation is best known?
Nhp, the number of habitable planets in our galaxy
Which of the following factors in the simplified Drake equation is least well known?
fnow, fraction of civilization-bearing planets that have intelligent civilizations on them now
If the communication lifetime of civilizations in our galaxy is 10,000 years and our galaxy is 13 billion years old, what is the chance of us detecting another intelligent civilization now?
1 in 1,300,000
The fact that many different organisms on Earth have developed eyesight provides evidence for
Why are radio waves probably the most efficient way to communicate between civilizations?
radio waves are easy to produce and are not affected much by interstellar matter in the galaxy
Currently in the USA, SETI programs are mostly funded
If we were to intercept a strong radio signal at 1420 MHz in binary format from another civilization, this would be an example of
an intentional signal beacon
The search for radio signals from intelligent civilizations on planets around nearby solar-type stars is an example of a
Which of the following is a difficulty associated with interstellar travel?
- the enormous amount of energy required to accelerate any ship to high speed
- the huge distances between the stars
- the speed of light being the fastest possible speed we can travel
all three are difficulties
Traveling at their current speeds, how long would it take the Pioneer and Voyager probes to travel the distance to the nearest stars?
at least 100,000 years
The energy required to accelerate a ship the mass of an ocean liner to a cruising speed of 10% of the speed of light is approximately
one hundred times the Earth's current annual energy usage
How is the "Fermi Paradox" normally stated?
Where is everybody?
The Pioneer probes carry what kind of physical time capsule?
a small engraved plaque
The rocket equation describes how a vehicle's final speed depends on
the propellant's velocity
The observed slowing down of time predicted by Einstein's Special Theory of Relativity for an object traveling close to the speed of light is referred to as
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