(Solved by Humans)-QUESTION 1 Which of the following factors in the Drake equation

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QUESTION 1

Which of the following factors in the Drake equation is least well-known?

Select one:

a. The rate at which Sun-like stars are forming

b. The fraction of Sun-like stars with planets

c. The fraction of planets where life evolves

d. The fraction of planets where intelligence evolves

QUESTION 2

An astronomer who asks the question "Where is everybody?" is likely to believe that

Select one:

a. SETI research is a complete waste of time

b. there are few, if any, extraterrestrial civilizations in the Galaxy

c. there are many extraterrestrial civilizations in the Galaxy

d. extraterrestrial civilizations are deliberately hiding from us

QUESTION 3

Which of the following were included on the Voyager records?

Select one:

a. Johnny B. Goode

b. The Magic Flute

c. Songs of humpback whales

d. Pictures of Earth from space

e. [All of the above.]

QUESTION 4

If extraterrestrial civilizations are common in our Galaxy, the probability that one of them will recover the Pioneer or Voyager messages is

Select one:

a. certain

b. likely, but not for at least 1,000 years

c. zero

d. uncertain, but not for at least several tens of thousands of years

QUESTION 5

A formula for estimating the number of extraterrestrial civilizations in our Galaxy was developed by

Select one:

a. Carl Sagan

b. Frank Drake

c. Harold Urey

d. J B S Haldane