1. What strategies and electromagnetic frequencies are thought to be the most lo
ID: 292814 • Letter: 1
Question
1. What strategies and electromagnetic frequencies are thought to be the most logical for long-range communication across the universe with other intelligent beings?
a. explosion of nuclear devices at specific intervals and in specific patterns across Earth when we are closest to a nearby star
b. night-by-night photography of nearby stars at hydrogen Balmer wavelengths
c. continuous radio and microwave listening and transmitting at frequencies at which the natural radio sky noise background is low
d. X-ray surveys of space at appropriate times (e.g., when Earth is closest to nearby stars in its orbit), in view of the penetrability of space at these wavelengths
2.
What is the current state of the search for extraterrestrial radio communications?
a. Several extraterrestrial civilizations have been found, but they are not intelligent enough for us to bother with and the search is continuing.
b. Occasional single-frequency searches have been made for extraterrestrial signals, but funds are still being sought for the first major continuous monitoring effort.
c. A number of frequencies in the “water hole” are being monitored, but there has been no major effort as yet to send out continuous signals from Earth at these frequencies.
d. Continuous transmissions are being sent out from Earth at several frequencies in the “water hole,” and tens of millions of other frequencies are being monitored.
3. For which of the following factors in the Drake equation do we actually have observational knowledge rather than just a speculative estimate?
a. R*, the rate at which solar-type stars form in the Galaxy
b. fl, the fraction of Earthlike planets on which life actually arises
c. fi, the fraction of life-forms that evolve into intelligent species
d. fc, the fraction of intelligent species that develop adequate technology and then choose to send messages out into space
4.
Which of the following phenomena was probably not a source of large organic molecules, the building blocks of life, on the early Earth?
a. comets
b. meteorites
c. lightning flashes in the early terrestrial atmosphere
d. volcanic eruptions
5.
The Miller-Urey “experiment” consisted of
a. sending a coded message via radio toward nearby stars that are similar to the Sun and may have planets.
b. attaching a metal plaque to the Voyager spacecraft to tell extraterrestrial beings about us, should the spacecraft ever be recovered.
monitoring tens of millions of radio frequencies at once in an effort to detect extraterrestrial radio communications.
d. passing an electrical arc through a mixture of hydrogen, ammonia, methane, and water and looking for resulting organic compounds.
a. explosion of nuclear devices at specific intervals and in specific patterns across Earth when we are closest to a nearby star
b. night-by-night photography of nearby stars at hydrogen Balmer wavelengths
c. continuous radio and microwave listening and transmitting at frequencies at which the natural radio sky noise background is low
d. X-ray surveys of space at appropriate times (e.g., when Earth is closest to nearby stars in its orbit), in view of the penetrability of space at these wavelengths
2.
What is the current state of the search for extraterrestrial radio communications?
a. Several extraterrestrial civilizations have been found, but they are not intelligent enough for us to bother with and the search is continuing.
b. Occasional single-frequency searches have been made for extraterrestrial signals, but funds are still being sought for the first major continuous monitoring effort.
c. A number of frequencies in the “water hole” are being monitored, but there has been no major effort as yet to send out continuous signals from Earth at these frequencies.
d. Continuous transmissions are being sent out from Earth at several frequencies in the “water hole,” and tens of millions of other frequencies are being monitored.
3. For which of the following factors in the Drake equation do we actually have observational knowledge rather than just a speculative estimate?
a. R*, the rate at which solar-type stars form in the Galaxy
b. fl, the fraction of Earthlike planets on which life actually arises
c. fi, the fraction of life-forms that evolve into intelligent species
d. fc, the fraction of intelligent species that develop adequate technology and then choose to send messages out into space
4.
Which of the following phenomena was probably not a source of large organic molecules, the building blocks of life, on the early Earth?
a. comets
b. meteorites
c. lightning flashes in the early terrestrial atmosphere
d. volcanic eruptions
5.
The Miller-Urey “experiment” consisted of
a. sending a coded message via radio toward nearby stars that are similar to the Sun and may have planets.
b. attaching a metal plaque to the Voyager spacecraft to tell extraterrestrial beings about us, should the spacecraft ever be recovered.
c.monitoring tens of millions of radio frequencies at once in an effort to detect extraterrestrial radio communications.
d. passing an electrical arc through a mixture of hydrogen, ammonia, methane, and water and looking for resulting organic compounds.
Explanation / Answer
c. continuous radio and microwave listening and transmitting at frequencies at which the natural radio sky noise background is low
d. Continuous transmissions are being sent out from Earth at several frequencies in the “water hole,” and tens of millions of other frequencies are being monitored.
a. R*, the rate at which solar-type stars form in the galaxy
d. volcanic eruptions.
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