Which of the following is true of Jupiter's moon Europa?
A) It is rich in organic molecules and water.
B) It appears to have a liquid-water ocean below its icy crust.
C) It has methane in its atmosphere.
D) It was brimming with life in its history.
Question 2
In the Drake equation, Nc = N fp nHZ fL fI fs, the factor nHZ is:
A) the average number of planets in a solar system.
B) the average number of stars that have planets.
C) the average number of planets where life evolved to intelligence.
D) the average number of planets in each solar system suitably placed in the habitable zone.
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